4g is so much better than 3g. Just look at the Retina display for 10 minutes and you will be convinced. Plus the cameras are always handy and with FaceTime that's another big plus for the 4g.
It's has the novelty appeal for a while and then it just gets old. Kinda of like when the Wii came out and everyone loved it so much, and now everyone of my friend's who has a Wii has it in the garage.