Rukia for the win! 
And back to the topic at hand 
My lvl 34 regen scrapper has integration and he NEVER gets held, knockbacked, immobilized or anything. So from my experience i would say. You don't need it
Depends what you're aiming for. In the course of normal PvE play, I'd say it's overkill; for a PvP-specific build, I could see the point in a) having extra mez-protection; b) having extra toggles.
@Synaesthetix
"Here, take some more bees with you. You may need them."
Union: FU//LoUD
"that Syn is that that" - Mothers Love
Tend to agree with Syn. It's overkill for PvE, Integration is quite good enough. For PvP it's an option since they reduced the mez resistance of Intergration and Controllers will just spam you with holds until they max out your resistance.
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.
Im not sure but from my experiences Integrations mez protection appear to be less this issue then previously which means that it is very possible to be held or immobolised if they are stacked - which made killing lvl 3 Master illusionists very tricky when the tank kept dying tho im part of the old skool 'regens can still tank' philosophy
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
For PVE acrobatics is not needed, just keep one break free about your person as has been stated it is possible for you to be held but very unlikely (I normally team with SG in 6man+ invincible mish and I use a break free once overy couple of days or so...would rather use a break free than an extra power for that).
I have only done very limited PvP, and my experience against dominators was I was still popping break free's like sweets so I don't really see what difference an extra little bit of protection is going to do, if they are spamming holds, you will still get held, just pop a break free and introduce them to your friend "High or superior damage attack" (as I said, very limited PvP experience, just what it seemed like to me, maybe someone with more PvP experience could comment to its use better)
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Im not sure but from my experiences Integrations mez protection appear to be less this issue then previously which means that it is very possible to be held or immobolised if they are stacked - which made killing lvl 3 Master illusionists very tricky when the tank kept dying tho im part of the old skool 'regens can still tank' philosophy
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In god knows how many hours (which ped do you use to check BTW?) Lost Ninja has never been held, disoriented, or any of the things that it protects from with Integration running. Thats ever. If it happenes it's because I wasn't running it or I'd had it dropped, normally by a sapper.
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In god knows how many hours (which ped do you use to check BTW?)
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Any starting with M.
I don't think it's worth taking Acrobatics for a regen, it only gives resistance to one hold (so that makes it mag 3 I think) and if you're taking that many holds you'll probably die anyway. There are much better powers you can get.
Thanks for the tips guys. I've decided not to go with Acrobatics. If I do get held then they still have to get past my inherant regen abilities before I can pop a break free and hit IH so it doesn't really seem worth it to waste all those powers 
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Acrobatics with my regen scrapper? I've been advised that it's best to take it however I didn't want to take SJ. From rough figures gained on the US boards I would assume that integration will provide a very high mag hold resistance in the 40's.