iPhone 4s 32GB GSM (AT&T) black
Received mine via UPS on launch day.
settings -> general -> usage -> time since last full charge:
Usage: 2 hours 47 minutes
Standby: 4 hours 37 minutes
Combined Total: 7 hours 24 minutes (I don't know how this is possible when I unplugged it from the charger at 7:30 am, which is a little less than 5 hours ago?)
Current battery remaining: 64%
Turned off everything that isn't necessary as posted numerous times in previous posts beginning Monday. Same problems occurring as evidenced by my above statistics.
NOTE: Our household also upgraded iPhone 3GS 16GB and iPad1 wifi only 64GB to iOS5 and seeing similar battery draining problems.
In my humble opinion this is a combination of iOS5 and iCloud software issues and the fact that the A5 processor requires a heck of a lot more power than it's predecessor. Look at the dramtatic increase in battery hardware from the iPad1 to the iPad2. The original iPad had a couple of batteries that occupied about 65% of the bottom of the case. The iPad 2 has 3 batteries that occupy 100% of the bottom case. Why? Because the processor needs it!
As an earlier post notes, the battery increase from the iPhone 4 to 4S was insignificant. So why would Apple make a significant change in the iPad and not the iPhone when moving to more powerful processors? Because they needed to get a product to market and weren't ready to launch the iPhone 5 (which all reputable sources show a larger cased version to accommodate a larger battery).
Apple will most likely come out with some firmware patches that will help to resolve this issue. But no matter what device you own, if you're running iOS5 and iCloud you're going to see a reduction in battery performance. More functionality requires more power. In the case of the iPhone 4S, don't expect to run Siri and all of the other features that a smartphone is supposed to be able to run (without having to toggle things on and off all day to spare battery life) and expect a full days use out of it with the current hardware configuration.
I'll stick it out until next Thursday and if Apple can't get it right by then they'll be taking another 4S back and I'll wait for the 5. Unless Android comes up with something better.