Quote Originally Posted by UtherSRG View Post
Not only does IPS not stack with AF/IAF, but they are mutually exclusive, you can either have AF or IPS turned on. Once I got IPS, I turned it on and left it on. I'm not in the habit of changing my stance, and I'm not sure I'd want to. If I'm up against a single stationary target, it's probably a ranged attacker, so I'm always moving to minimize hits on me. This makes AF/IAF useless. If I'm up against anything else (moving target, group of targets, etc) I'm rarely standing still, too, and more likely to benefit from IPS (and SOTR!) so I'm not sure why I'd ever take IAF.

But I'm not sure where else I'd spend the 2 points anyway.... Maybe something on the racial tree.
I find myself swapping fairly often depending on the situations that present themselves.

It's also quite nice to build up some stacks of it before hitting all of your boosts and doubleshot for bosses or other mobs that must die quickly.