ok im back after disappearing online for a few days. the 4s is pretty nice, i wouldn't say it's a huge upgrade over the 4 but still a decent upgrade if you're into the processor speed, battery, camera, and the 64GB. I can't get used to Siri so I won't be using that feature very much, still needs some tweaking. The camera is far noticeably better than the 4, battery lasts a lot longer, speed has improved greatly as I didn't have to wait for anything to load for long, graphics as well when playing games. speedtest.net didn't show me a better result than the 4, sometimes slower and sometimes faster.... signal bar is always on full, the 4 was always on 3 or less so Apple has finally fixed the antenna on this one.
Overall, I'm happy with the upgrade, paid $400 for the 64GB. Sold the 4 16GB for $325 so it cost me about $100 in the end.