Upgrade likewise went smoothly. Do note that if you have licensed programs, you may have to reinstall them or at least re-enter the license key. That wasn't an issue with Microsoft programs (i.e.,Office) but it was with a third party one. Startup takes some getting used to, but it has grown on me. I tried Classic Shell and ultimately went back to basics. Once I got the active tiles the way I wanted them, I was pretty satisfied.
Functionally, it is fine. Like a new edition of Word, it takes a while to figure out where you have to go to do something, but overall, not bad.
Boot up is fast. That Safe Mode is a little problematic. Getting into it on a working OS is fine, though not do easy if the OS is not running (I installed a bad driver, got in a loop at startup, and had a problem getting out. If you don't have a media disk with the OS downloaded on it, get one.). There is a registry fix for that, though, so that you can choose it via F8 at boot, just like we have always done, and I did that.