I can't say for Thunderstrike as i don't play elec melee but, i tend to like the force feedback proc in an aoe attack i use every 10sec or more, typically a cone (shockwave, energy torrent...). If you spam it too much you'll waste the proc as it has its own timer to reapply. It procs fairly often if you hit 5 mobs or more with the attack 
Dark armor lover.
The Claws/DA Scrapper guide.
Depends what you want to slot it with as far as set bonus goes.
Obliteration 5 slotted is (relatively) cheap, and offers good recharge. 6 slotted is good defence values for melee/smash/ethal.
While Sciroccos dervish is good for AoE defence.
and if you can 5 slot a purple set and want the recharge, Armageddon will give 10% recharge.
imo, all offer good native enhancement values.
in response to force feedback, if you can afford the slot, go for it should proc fairly often on decent size mobs.
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Originally Posted by VoodooGirl
[*]Watching out for the Spinning Disco Portal of D00M!*
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If I need the AOE defence, 5 scirocco's (all but the damage proc) and the force feedback proc would be my preference, but for invulnerable I might go for 3 eradication, 2 scirocco's and the force feedback, or 3 eradication and 3 cleaving blow in order to pick up some handy energy/negative defence bonuses.
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My priority on melee toons is Defense, so I agree with this, on an Invul. This combo gives the biggest bonus to E/NE that I could find.
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Originally Posted by Streetcleaner
3 eradication and 3 cleaving blow in order to pick up some handy energy/negative defence bonuses.
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My vote for 3 era + 3 cleave too! 
Thanks for all the help!
I tend to go with 5 of Scirocco's Dervish on my PBAoEs and play around with the 6th slot, but I'll certainly look into all the suggestions!
Current Scrapper Projects: Elec/Invuln, Fire/SR and the eternal MA/DA adventure
Current Defender Projects: Emp/Psy and Storm/Arch
lol Stalker: Nin/Nrg
I've been playing with possible builds for my Elec/Invuln Scrapper and was looking at the various ways that Thunder Strike could be slotted. I figured instead of starting at the screen, it'd be way more useful for me to ask the Scrapper experts (which I am certainly not).
Would it be a good idea to slot the Force Feedback +Recharge proc into Thunder Strike?
Thanks!
Current Scrapper Projects: Elec/Invuln, Fire/SR and the eternal MA/DA adventure
Current Defender Projects: Emp/Psy and Storm/Arch
lol Stalker: Nin/Nrg