I must have had dozens of different phone covers, wallets and protectors over the years, but I think this is the best one of the lot. The case material is soft and quite stretchy but it doesn't lose its shape at all, which makes its really easy to get on and of, but its design means it clings snuggly around a iphone 4s so there's no chance of it coming off accidently. The edges of the case that fit round the screen mean you can put it face down and the screen will still be a few mm off the surface, which again helps to protect.
Its light and doesn't smell rubbery and it feels comfortable in the hand and not sticky or slippy. The holes line up perfectly and my oversized Sony headphones fit in ok because the case is soft enough to stretch the hole a little bit bigger (unlike ridgid cases where they just won't go in!).
The volume and power buttons are covered over and just have an imprint of what they are on the case, which means you press on the rubberised case itself, this is clever because it keeps those buttons clean.
There is a hole at the back for the camera which doesn't affect its view and the two lego type pieces on the back come off and allow you to change their location, I find it quite a therapeutic thing to fiddle with, bit like popping those little plastic bubbles...
Looks might put a few people off and might be a bit to funky for some, but I think its fun as well being practical.
As for protection it really feels like it can absorb shocks really well and dropping the phone onto the table a bit harder than you should produces nothing more than a little bounce. A really well made and thought out product, can't fault it - excellent! And believe me I'm a grumpy middle aged man I don't like much!