1 simple click of a button and my warranty is no longer voided, not like a warranty with Apple really does you any good. If it breaks you're buying a new one pretty much no matter what.
Also AT&T is far and away better than Verizon as I had Verizon for 10 years and it was awful. I've never had a single dropped call or an instance where someone called me and it didn't ring, that I heard about at least, and I get service everywhere I've ever been. I can't imagine what's not to like. If Verizon is considered the best and AT&T is that much better than I guess I'm on the best network as well.