2 desktop PCs on Windows 8.1. Love it, especially the fast boot or restart time. I also installed an SSD drive for the OS and other software, with a large hard drive as a secondary for all data, and that approach also speeds up the PC.

I have not experienced any significant problems, and would wholeheartedly recommend it.
_________________________
Graham, Korg Pa1000, Korg G1 Air, Countryman E6, Roland BA330, 2 x Roland CM-30, , Mackie SRM150