I have a 4S, threw in my order for the 5 that will be here in ~20 days or so according to AT&T. Question is, for those who upgraded from the 4S, is it worth it? I am considering just selling the 5 for a hefty $500 profit, and just keep my 4S. But a big part of me just wants to keep it and sell my 4S. Is it worth it?