iPhone Question

I have an otter box on my iphone4 it is a love hate relationship. Its big and adds weight to the phone but It has saved me a lot of times. I take it apart and clean it about once a week too.

My boss has the mophie and loves it but he has gone through 4 of them in a couple months. All warranty replacements, he is hard on them but going through that many seems bad to me.