Well, after almost a days 'normal' use I have to say I really like it. The little tweaks to the UI/Fonts & menu toggle switches look really nice, notification centre is excellent. And it feels very smooth and refined to use.
I've only come across one app with an issue so far and that is the Times app for the iPad which crashes on start and never actually loads, but not worth crying over seen as the OS hasn't been released yet, although I'd have though that especially major apps like that would have been tested/updated by now.