Maybe if you watch this demo...
Keep in mind though that this was when IH was still a toggle, but with IH active you're an invincible machine. Though you couldn't herd that many up anymore.
World of Jackcraft.
The demo appears to be an unknown filetype.
But to the OPs question. Regen is arguably the most potent scrapper secondary at present, whether that's true after the release of i7 remains to be seen.
What I can tell you is at lvl43 I could flatten a lvl50 SR scrapper in the arena.
Even with perma-dull pain gone and IH being a clicky and not a toggle the regen scrapper is VERY powerful. I'm 48th lvl and go toe-to-toe with 53 bosses and, eventually, win.
(\_/)
(O.O) Bunny: Our time is coming
(> <)
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Maybe if you watch this demo...
Keep in mind though that this was when IH was still a toggle, but with IH active you're an invincible machine. Though you couldn't herd that many up anymore.
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Come on Chives. Any tanker could have herded 5-10 as many. 
Anyway tough, weave and instant healing and 8 man spawns werent really a problem. Fun stuff
A Paragon Defender
My scrapper is /Regen, and i am finding it a VERY good set, i can go up against almost anything and survive 
, which is a nice change from my 'troller, on a non-related note, how do i play those CoH demo's? (i want to watch the vid posted here), i have tried /demoplay and /playdemo and it doesn't work 
Regen can be great, if you pay attention to which powers you use in which circumstances. If you try to take the alpha from a medium to large sized group without dull pain up or instant healing turned on then you can get squashed very quickly.
Defiant 50�s: Generalissimo, Righteous Bob, Splortch, Brutus Cayuga
Union 50's: Chimera Obscura, Diet Anthracite, Grim Proctologist, Puny Little Minion, Raging Bitumen
In Soviet Russia, mission farm you!
If you watch the video you will be given false hopes anyway..
Dont go into regen thinking you will be able to walk into a mob and not dip into a colour other than green, thats simply not realistic.
It used to be that whatever could not kill us outright, was not gonna kill us. That however is unrealistic now.
You sound as though you have played scrapper before and for that I am glad, too many scrapper go right into the centre of a group rather thans stay on the outside and nibble your way in as it were. How is this linked to regen?
Well regen copes evry well with proper scrapping, it does not deal with 8 mobs wacking you with sticks anymore.
When I was playing Krunch the only times I died were.
@ When I was a noob and plowed in to mobs and got myself right in the centre, taking damage from all sides.
@ When sapper's or carnies stole all my endurance. Therefore dropping toggles.
@ Circle of thorns and their stacking quicksand. Though I think they took this away, it was a nightmare for MA.
You will see a lot of hype about IH. The power will not allow you to plow solo into a group of reds, actually it will but only when your a tad higher level. It will allow you to regen faster (naturally). Its great for popping before AV's and boss's. But all this stuff about 1 Regen scrapper could tank hami with IH is just stupid..
Be wary of MoG, make sure you read every single piece of info on the power. In some situations its just playing with fire to use it.
One great power that looks very humble at the start, but is great in the latter level's when SO's are flying about, is reconstruction. You can get the power which is a reasonably good heal to recharge very quick with hasten and a few recharge SO's. Dull pain yes no longer perma, I used it mainly as a heal rather than a boost.
One day I should write a guide...
K
One last word. Other scrappers will look down on you and say oh you took the easy way, regen is an I win button etc.. Its stupid and massivly untrue. There are some people in CoH I would just love too see play the regen set, they would be shocked I tell ya, SHOCKED! 
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You will see a lot of hype about IH. The power will not allow you to plow solo into a group of reds, actually it will but only when your a tad higher level. It will allow you to regen faster (naturally). Its great for popping before AV's and boss's. But all this stuff about 1 Regen scrapper could tank hami with IH is just stupid..
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Well it's not stupid becuase a regen scrapper could tank Hami.
Without aid too, Regen Scrappers used to complain when they were healed during Hami raids.
World of Jackcraft.
I have watched personally a Regen Scrapper Tank Hami. No videos or anything, I was there. :P
Me being me I had to try I lasted less than a fraction of a second.
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You will see a lot of hype about IH. The power will not allow you to plow solo into a group of reds, actually it will but only when your a tad higher level. It will allow you to regen faster (naturally). Its great for popping before AV's and boss's. But all this stuff about 1 Regen scrapper could tank hami with IH is just stupid..
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Well it's not stupid becuase a regen scrapper could tank Hami.
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Maybe sometime in history but I have not witnessed it without 1-2 empath backup. 
Some comments on playing a regen scrapper. I have two now, one at 45, the other at 30. I like playing regen, it suits my style.
What Krunch says is mostly true, and also way too pesimistic. He has his prejudices, just like everyone else, including me.
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@ When I was a noob and plowed in to mobs and got myself right in the centre, taking damage from all sides.
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Like this one. I do this all the time and live. Like anything else, it depends on picking your targets. Rush a mob of reds, potential faceplant, oranges and you're okay, but it depends on your build.
Your biggest issue with regen is alpha strikes. You have (effectively) no resistance or defense, the only soak you have for alphas is your Max hit points. This is why Dull Pain is so important, it increases Max HP.
Your bread-and-butter power doesn't come until 16, and that's Integration. Before that, being regen isn't terribly easy. It's probably a bit harder than being anything else (due to lack of defense or resistance.
Integration is your only toggle, and it's a very good one. It provides good status effect resistance, and a substantial increase in regeneration rate, but it is a toggle, so it can be taken down. This is where IH comes in. It cannot be dropped, it just boosts your regen rate and keeps you alive while you try to keep going. (That's how I beat Ringmistresses.)
IH will not allow you to solo AVs (not anymore anyway), but combined with Dull Pain it gives a substantial enough boost in regen performance that you shouldn't have to worry about alpha strikes from AVs.
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Be wary of MoG, make sure you read every single piece of info on the power. In some situations its just playing with fire to use it.
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Yes, be wary of MoG, but also don't believe those who say it's useless. I tanked Infernal solo last night running MoG. OTOH, if I used it to try to take down a Ringmistress I'd be toast. It's vulnerable to auto-hit attacks, very vulnerable to psionics, and also to very large numbers of opponents (because there's more chance some of them will get through the defense). As long as you remember that, it's a very useful power which can pluck victory from defeat. It's even useful against auto-hit and high Accuracy or massed numbers, just so long as you use it as a temporary shield and run like crazy.
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One great power that looks very humble at the start, but is great in the latter level's when SO's are flying about, is reconstruction
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'Modern regen theory' says get Reconstruction early and slot it fast. 2recred, 3 heal. A third recred is viable, but I don't think it makes enough difference to the recharge time. Matter of taste. Currently, Reconstruction will deliver back about two thirds of War Crow's hits to him every 36 seconds, if required.
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One last word. Other scrappers will look down on you and say oh you took the easy way, regen is an I win button etc
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Never had that. Most of them just look at you and groan because you're ready to go and they're still regening hits or endurance.
Regen is not an 'I win' button. It is a relatively lazy way to survivability, until the proverbial hits the air conditioning, and then it's just as hard as anything else is.
Disclaimer: The above may be humerous, or at least may be an attempt at humour. Try reading it that way.
Posts are OOC unless noted to be IC, or in an IC thread.
To add to to this, regen also has the magic auto power labelled "Quick Recovery." Between this and stamina, short of concerted drain (ring mistresses or sappers) you're unlikely to run out of end under normal (ie you aren't using 5 extra toggles) circumstances. Take it, slot it, sleep with it.
Do not go gentle into that good night.
Rage, rage against the dying of the light.
Regen is the best scrapper secondary due to having the best power Quick Recovery... Regens laugh at endurance woes of the other scrapper sets..
And like others have said Dull Pain, Reconstruction and Integration are the cornerstone of regen nowadays.
I have a L50 and L38 regen, one with tough and one without. Tough does increase survivability and gives you something to do with all that end
I also think MoG has its uses (as long as you realise its negatives)
I would never say that regen is the best secondary, it is for me but certainly not for everyone.
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To add to to this, regen also has the magic auto power labelled "Quick Recovery." Between this and stamina, short of concerted drain (ring mistresses or sappers) you're unlikely to run out of end under normal (ie you aren't using 5 extra toggles) circumstances. Take it, slot it, sleep with it.
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I can't wait to get Stamina on my Claws/Regen... oh boy does my endurance disappear quickly (running Integration and occasionally Combat Jumping) 
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Dirty Regens! HISS 
It just doesn't work for me, but nonetheless, they do a job, and do it well enough.
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You will see a lot of hype about IH. The power will not allow you to plow solo into a group of reds, actually it will but only when your a tad higher level. It will allow you to regen faster (naturally). Its great for popping before AV's and boss's. But all this stuff about 1 Regen scrapper could tank hami with IH is just stupid..
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Well it's not stupid becuase a regen scrapper could tank Hami.
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Maybe sometime in history but I have not witnessed it without 1-2 empath backup.
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Got a demo of me doing it a while back, Ill have a search for it when I get home and post it up.
..name me a tank that can tank Hami without 1-2 empath backup?
Well apparently Xironia, oh and guys the could was meant to be read in the present tense but nevermind..........
K
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..name me a tank that can tank Hami without 1-2 empath backup?
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Well it's not stupid becuase a regen scrapper could tank Hami.
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Notice the emphasis on 'could', he didn't say 'can'.
World of Jackcraft.
and here is your friendly neighbourhood hami-tank.
albeit with empath back-up
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..name me a tank that can tank Hami without 1-2 empath backup?
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Well it's not stupid becuase a regen scrapper could tank Hami.
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Notice the emphasis on 'could', he didn't say 'can'.
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That's irrelevent. I didn't say a Regen couldn't tank Hami I'm saying that whoever does need to tank Hamidon can't do it on their own.
Actually.
I can tank Hamidon solo, on my blaster
....For 0.32 seconds >_>
That's more then my Scrapper
Hey, I've been hesitant to make a Regen scrapper or stalker now for a while, because I can't get the thought of my head that they won't be able to regenerate fast enough to deal with the enemies.
Can anyone dispel this? Tell me just how Regen can be?