We have both upgraded and zero issues so far. The one issue my wife had with PC not waking from keyboard turned out to be a BIOS setting, and it took me a while to find the BIOS . Really happy so far. My work laptop (HP) with Win 8.1 is a bit less stable, but that has almost exclusively been due to AMD videodriver (2014 driver that was installed on it crashed when hooking up a Displayport second screen, and after upgrading one day the driver just stopped working and I had to reinstall it.