I love OtterBox. I am on my third. The first broke prematurely, and they replaced it, no questions asked. The second lasted me about 18 months, but since I have a habit of dropping my phone / accidentally throwing it across a room, it eventually fell apart. This is now my third, and I am very happy with it. As I mentioned, I often drop my phone, and am pretty rough with it. Otterbox has protected it fully and completely. I highly recommend it.
The one criticism - due the the nature of the protection of the case, it makes the whole thing a little bulky. But, I chalk that up to balancing priorities.