LifeProof Iphone case opinions please

I really want to get a Lifeproof Iphone case, because they claim to be 100% waterproof, which is what I really want! But the warranty from what I understand will not replace your phone if the case doesn't work. I need to know if anyone has tried this case and if it works well, because I don't want to spend $80 on a phone case and have it not work, and break my phone.

Best case ever I have taken video pictures listened to music the whole nine yards and it works great but only trouble I had was don't buy one from eBay buy it from a trustworthy dealer cause they doo make remakes!