Upgraded from an iPhone 4 to an iPhone 4S (two-year contract on AT&T). I've had it for about 4 weeks.

The only complaint I have is the lower battery life compared to my experience with the iPhone 4. I have to charge the iPhone 4S every night (and maybe even in the evening). I could get by 1.5 - 2 days on the iPhone 4. (Note: I do have firmware 1.0.1).

Everything else is absolutely wonderful. The DESIGN is top notch. It feels great in my hand, it looks great everywhere. I don't use a case. I love the DISPLAY and the auto-brightness controls tend to be spot on. It has the best CAMERA I've ever used on a smartphone. Even when they are blown-up on my 27" monitor they look good (certainly not DSLR quality, though).

I didn't give RECEPTION/CALL QUALITY a 10 because I have had dropped calls. This is most likely because I'm on AT&T, Central Texas area. Certainly no worse than any other phone I've had in the past.

Have nothing bad to say about PERFORMANCE. I do not recall any crashes or even lag (except when I open Newsstand when it's already in a folder - but that's my bad). SOFTWARE is great. I love iOS5.

Siri is a great feature but certainly not 100% up to Apple's usual seamlessness. When looking for places to eat or drink, I use Siri exclusively now.

Last but not least, I think we can all agree that the iOS ECOSYSTEM deserves a 10. App Store has everything.