The Otterbox does a great job protecting my phone from damage. I work in an environment where phones tend to get dinged up a bit. The only problem I have had it the tab at the bottom (where you plug in the phone) has worn away twice, but Otterbox was understanding and replaced it both times within a week.
I dropped my phone, the Otter box case fully protected my iphone 4s. However, the case got damaged. The online customer service to get a new replacement case at no charge was easy and fast
I got a replacement case after the first one cracked right above where you charge the phone. I had dropped it twice and on one of those times it did crack. The phone however was fine.
I have the Otterbox Commuter Series and although it is not technically "life proof", I have never had a single scratch on my Iphone (knock on wood). I have dropped my phone countless times, even on surfaces such as a metal dumbbell, the only damage has been to the case. Which I think says quite a lot about the product Otterbox has created. I would highly recommend this product to anyone who prefers to keep their cellular devices for an extended period of time.
I have bought several covers for my phones in the past, they did not amount to much, but when I bought an Otter box cover I found it so good I bought a present for family two more otter box one for my daughter and one for my wife.