Try doing the pinch to close an app. You get a weird graphical glitch toward the end. Happened on my iPad 4 (clean install) and my cousin's iPad 4. Fortunately I had enough time to go back to iOS 6, my cousin stayed on 7. Going from iOS 7 to iOS 6 on the iPhone felt outdated and ancient. However, going from iOS 7 to iOS 6 on my iPad just felt perfect. It was so much more smoother.