My Otterbox Defender finally tore after close to a year. Followed the directions on their website and they sent me a new one in less than a week. It fits pretty well on a standard leather duty belt. I've heard some issues with the clip, but I didn't break mine. The clip & case they just sent me is a little bit different than my old Defender. Seems to fit better and the clip feels stronger. Maybe they took some advice from LEOs about the clips and adjusted the newer Defender series. I've also heard rave reviews on the lifeproof cases, but don't feel like paying the $70-$80 pricetag on them. Otterbox replacement was FREE.
I have an IPhone 4s.