I'm happy with iOS 11, I was tempted to load it as a beta on my 10.5, because everyone mentioned how great it was. I'm a little underwhelmed by it. Don't get me wrong, its not bad, but I kept hearing how my iPad Pro is being held back by 10.3 and I needed iOS 11 to really show its power. As someone said previous, its a nice incremental step forward.
I rolled both of my iPads back due to laggy/jerky performance, but I really liked the new keyboard and all the flexibility and functionality in the iOS 11 dock.