I have had all 3 otterbox cases/phone covers/shells whichever you'd like to call them.
Impact was junk, just a slip on case, spend the extra 5 bucks of whatever to get the Commuter.
Commuter is sweet, I use it as my every day cover when I'm not at work my only complaint is that the rubber around the top speaker and camera is stretched looser than a porn star's asshole but the case looks and performs well. A screen protector is a must since the commuter does not have a built in one like the defender.
Defender is pretty sweet, I do construction and i am constantly banging into things and I have to use my phone a lot. It's very durable and keep it protected I dropped it off the 4th story of the retirement building that's going up and I ran down and picked it up and works perfectly. Obviously it's far too big for fit in pockets, hahaha. Hence the reason it comes with the belt clip, it looks and performs its job superbly. My only gripe is the rubber sometimes gets loose around the edges but that's no big deal.