There are some bugs, Stutters are there too, especially when going into folders, checking out widgets & switching between apps. It's beta 1 so it still need needs a lot of improvements that I guess will be there in the next betas. If you are planning to upgrade, wait for sometime till the system becomes smooth. I'm glad to see that great new features are there like the new iMessage, new lock screen & new camera interface. I hope that big improvements are coming on the way. iOS 9 till now is a lot better but I hope iOS 10 would be better by the time it is released to the public.