iOS 7 Best Feature?

For me, it's the "back" gesture. I used both a Web OS phone and a Windows Phone before coming to iOS and I really missed having a back button or functionality. Using a swipe gesture to replicate it in iOS is absolutely genius as it doesn't invalidate previous iPhones and doesn't require you to get new hardware. This is super helpful as the larger iPhone 5 doesn't actually feel like I can put my thumb everywhere. I find myself having to constantly re-adjust my hand position, not to mention that various apps put their on screen back button in various place from top to bottom. Having it hopefully as a universal gesture (as I understand it, it's a function that's there for developers to use, not enforced, but will be integrated on all stock apps) will improve UI navigation.