I own a black iphone 5, my questions are for the ones who installed ios 7 beta and actively using on ip5. 1. is ios7 a gain on battery life over ios6 since ios7 seems to run more services at the background than ios6. not to mention that ios 7 is fully multitasking. 2. how is the ui performance in comparison to ios6 ? 3. can i easily revert back to ios6 ?