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Impale has a brawl index of about 5.39. That would have to be impressive resistance to overcome that difference in damage. LBE does have faster animation, but it doesn't immobilize the enemy and I think I'd prefer the tactical advantage that gives.
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I would get Quills twice before I'd get this once. Your whole build is aimed at being able to "stay in the fight" as long as possible. The longer you stay the more damage Quills does. Along the lines of the best defense is a great offense, this will reduce the amount of incoming damage, by helping to reduce the number of opposition. This becomes crucial once you've popped IH. The assumption is that it will keep you standing until it stops.
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My main is a 41 Spines/Regen. I have to disagree with the initial posts on Impale. As far as damage and, as mentioned above, the ability to immobilize a mob with a successful hit, its priceless. I have it 6-slotted with 1 Acc, 5 dmg and it is my most powerful attack besides Ripper. It hits for about 175-200dmg on +2 Minions - that is good stuff.
As for what was mentioned about Quills above, I like the power, but what you have to realize is that it drains a tremendous amount of endurance when you're fighting large groups of baddies. I forget the actual calculation but everytime it hits a mob, it reduces end, so if you're fighting a big group and you're successfully hitting a bunch of them every couple of seconds - you're gonna be in a bit of trouble. I've had all my toggles drop due to no end from Quills. That aside - I won't drop it from my build just yet, as it works very well when soloing or when in teams with either no tank or a tank that can't keep all of the aggro on him/herself.
If I wasn't at work and didn't have such a bad memory, I'd post my build.

It's worked extremely well for me and I've only respec'd once after hitting lvl 24. It is certainly true that lvls 1-24 and 24+ are played differently from each other.