I know this thread is dead now that the S4 has taken the S3's thunder, but I just wanted to share a story about my current case. I currently have UAG case on my S3, but having previously used an Otterbox Defender for nearly a year, I was really skeptical how much protection the UAG would offer vs. the tank that is the Defender. That question was answered today. I took the nastiest fall I've ever taken while on a ride today as the right crank on my ATB snapped mid-pedal. I was probably closing on 25 mph at that point and still building speed. While the S3 was the last thing on my mind, I happened to feel it smash against my hip as I went down right on top of it on the ground, then as I rolled it ejected from the universal holster that it was in, flipped, bounced, and crashed repeatedly a good 10 feet or so. Again the phone was the last thing on my mind, but it happened to be in my field of view almost the entire time I was eating the blacktop - well, at least that's how I remembered it as the entire thing was blur.
Anyway, after I finally got myself all patched up (thankfully nothing was broken) I used my phone for a few minutes before realizing it was in perfect shape, and the case only suffered minor scratches. I had also brought a Ballistic SG Maxx with me that I normally would swap out for on a ride, and having forgotten to do so I was concerned about the UAG. Now I completely trust this case and have no need for anything else when I'm out playing. UAG ROCKS!