Honestly I don't have to prove anything to anyone. My life proof case even has a crack in the top by the headphone jack cause I dropped it when standing up cause I forgot it was in my lap. My phone does randomly get dropped from different heights and I have yet to crack either glass. So I don't know what your friend did but she must have slammed it down when she got mad whether she wants to admit to it or not.
Wheeler: I think it's proven it's worth. As a sportbike rider it keeps my phone dry when I get caught in the rain (even with the crack at the top of the case) and it helps protect my phone from dropping regardless what others say. I've had my phone in this case since day 1 and I'm coming up on my 2 year end with sprint. Not a scratch, crack or defect. I think it's worth the $35 cause that's usually what a new glass and digitizer costs if cracked or worse if the phone gets soaked and stops working.