I played around with Split View in the store and honestly, I can't really think of a reason to use this often. It's more useful with a bluetooth keyboard because at least the on screen keyboard doesn't obstruct the entire screen. Slide Over is kind of silly because you keep having to swipe over to the other app and mess with it and it just goes away immediately after you switch back. Sometimes you have to double swipe it in like you're in a game, which is even less seamless. Anyway I'd love to hear if people are actually finding the multitasking in iOS 9 useful. So far I'm underwhelmed, but perhaps there's cool stuff I could be doing?