I just upgraded last night and so far I was hit head on with UI bugs.
Background image settings are a bit buggy, it doesn't want to remember some settings. My mouse driver that was ported from my 7 install half worked, but I got a notification that my hardware had changed so I needed to reboot in order for it to take effect. My mouse driver now works.
They changed a lot of things and the new control panel still doesn't feel quite complete, but it's a start (it would be nice if they would actually release something more than a start lol).
I think my only other complaint is that they changed Windows+E to "Quick Access" instead of Computer.
There is a native setting in folder & search options.
I like the driver updates through Windows Update. I know some people have had issues, but so far in my case it has only fixed issues and replaced outdated drivers 7 told me never even existed.