I've done a downgrade to iOS6 yesterday, because I'm selling me iPhone and iOS6 feels horrible compared to the new firmware. It feels like going back to a old Nokia model. The first few days/weeks with are not easy to understans the new philosophe. But: You want never go back to an older version. I miss: ComtrolCentet, Safaris Unified Searchbar and I'm missing very very much the swipe to back gesture. When you can't use the swipe anymore, you will see how often you have used the gesture since the introducing iOS7. And the most 3rd Party aren't updated yet and you can't use this gestures there. I think Swipe to back is one of the most powerful features in iOS7. Also tab handling in Safari in iOS7 is much easier. And the lack of ControlCenter. It''s a pain in iOS6 to enable/disable the flight mode.