I'm still using a 3G, it's almost the same as the original since they have the same hardware just different cases--and Apple chose to let the 3G have one higher version number of iOS. Haven't gotten my 4S yet, Apple's site still lists as processing, but I can imagine the difference is going to be night and day. I'm looking forward to the general speed increase more than any actual new feature. Not having to wait 1-3 seconds after pressing each letter on the virtual keyboard before the letter appears is going to make me happy.