On a brute? The activation time and endurance cost must be taken into consideration. It's powerful, and slotted up for intredux and heals, will give you a huge chunk of health back reliably in combat. Especially if you're in the middle of larger herds, invincibility and tough hide should mean you're getting hit very little and will be able to fire it off. My Inv tank never had any trouble using it, and his herds were occasionally very large.
The trouble is, if you're anything like me, I really needed aid self for CoT missions only, and CoT have so many nasty toggles and interrupty powers that it becomes an intercombat power.
I'd say, if you're doing fine for health, don't worry about it. You'll get a lot dodgier with Tough Hide, and the end drain on Aid Self is quite high, which can be quite bad for an Inv brute.
If you plan on dragging vast hordes of enemies around, it's probably a bit more necessary, but make sure you've enough slots going spare to 5 or 6 it.
DON'T eat muffins while I'm developing you.
Pants! Turkey Magnates! A man in a box! Rogue AI! Come one, come all, to arc ID 10107 - It's [i]'Not as long as some other arcs'[/i]!
My tank has awfully much trouble in using it, even with small 'herds' (3 heal 3 intredux). And I thought I have become decent in using it too, I use it in pvp on my blaster a lot. However, I think aid self on my tank was a bad idea.
I find that odd. My Inv Tank has pretty much all the Def he can lay his hands on, with Weave running on top - I rarely get hit in larger spawns. Definitely never ran into trouble using Aid self, specially when fully slotted out.
DON'T eat muffins while I'm developing you.
Pants! Turkey Magnates! A man in a box! Rogue AI! Come one, come all, to arc ID 10107 - It's [i]'Not as long as some other arcs'[/i]!
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I find that odd. My Inv Tank has pretty much all the Def he can lay his hands on, with Weave running on top - I rarely get hit in larger spawns. Definitely never ran into trouble using Aid self, specially when fully slotted out.
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Im not you. Im pointing out that aid self may work on one build but not all.
for a brute like you in pve aid self is not needed, it can be a very usefull power in pvp tho. Save your pool powers and get more needed powers for pve 
Is this useful in PvE? I'm currently a level 26 and I find Dull Pain keeps me alive perfectly fine, and I've still to sets of defence to get yet, 28 and 35 :P so would aid self help me much more!?
Would I beheld to heal while holding a herd? is maybe one reason I mite consider it! :P