The most daring claim that I found for a slim case was this email sent to me before the show for the NuGuard KX Kinetic Energy X-Orbing Protective Case for Apple iPhone 5 and 4/4s.:
"Know Any Other iPhone Case That Will Survive a 200ft Drop and Still Fit In Your Pocket???"
And it's more just an idle than a question, they also sent links to these videos, documenting their claims:
Check the 20 ft drop test.
Or the 200 ft drop from the OWC wind turbine.
When I went to their booth I asked if this bold claim was backed up by a warranty. The reply was that their case carried a 30 day money back guaranty, with a lifetime warranty—for the case. Well that's fine, but since they didn't offer to replace my phone if I didn't make it through the drops, I opted instead to watch as he repeatedly tossed his iPhone to the counter and floor to show me that he personally really trusted the case. I didn't ask if it was actually his personal phone, or belonged to the company, but nonetheless it was pretty impressive. And is is slim? Yep, it really is—honestly it's just a tad thicker than my original slim case. If you're looking to maximally protect your iPhone while keeping its slim profile, this is likely to be your best option.
I personally tested out each of these cases, and honestly I like all of them. There are, of course, a zillion options if you're looking for more flash, but if you just want just a little more character than the simple black, you'll be happy to know that all of these slimline iPhone 5 and 4/4S cases come in a range of much "funner" colors as well.