This is my fourth go around (3, 3G,3GS,4) with the iPhone on AT&T's network and I am far from completely satisfied, but I'm not about to pay a hefty AT&T ETF and the cost of a new iPhone just for perceived better voice service. I think I'll do a wait and see on how the service shakes out, and when my contract up, I'll pull the trigger if at all. This seems to be the consensus of my colleagues as well.