I dropped my iPhone, over eight feet, with my Incase slider, the phone cracked on the top (see pictures), but it protected the iPhone. There was no scratches or dents in my device. Three hours and thirty dollars later, I got a black one.
let me also say, I had dropped my case a couple of times before. This one was different because of the landing, it occurred directly on the top of the phone, which is where the crack occurred.
Good to know it did it's job! Now I might consider buying one. I just really hate any added size to the iPhone, and also this may seem a little "picky" but I REALLY hate covering the on the back of my phone! ha!