As far as i can tell about windows 10 :
* Upgrade option were not good. So i went through a clean installation
* Installing Visual Studio 2015 Enterprise tooked me 9 hours
* System overall is smooth, looks like a mix of android, windows 8 and windows 7. Atleast they removed some crap stuff from windows 8\8.1
* Stealth Client runs smooth
* Ultima Online runs smooth