FWIW, no problems with my 4S and IOS7. I will admit that when I first installed it I thought my battery life was degraded, but then I found the settings for the background processes, turned a bunch off that I didn't need, and after a couple of days of use everything was back to normal. Nor does IOS7 make me dizzy or sick. I quite enjoy the new look.
10/10/13 at 9:21am