I have the 4 (not 4S that im typing on right now actually) and depending on when I'm due for upgrade I may get the 5. But mainly because we are moving to NC and I want the kids to have a pone so they can FaceTime call grandma, etc. of course, they'd get my 4 and I'd get the 5.
But an iPhone for kids is pretty awesome so they wouldn't complain!!!
My only "worry""- not really a worry as much as a pet peeve is the new charger making all my old chargers and equipment obsolete. I'm sure there are adapters I can buy but still. It's an extra cost- wish they'd throw one in for free.