I think Windows 10 in general is fine, but the upgrade process does a poor job. For 2 of my machines, performing an update (not full wipe&#x2F;install) resulted in an extremely slow system. Doing the full wipe&#x2F;install corrected the problem.<p>Unfortunately, if one is coming from 7 or 8 (using the free update), you need to do the update to register your machine before you can reinstall cleanly. I don&#x27;t know why Microsoft didn&#x27;t just provide a Win10 product key via the update tool if your 7&#x2F;8 install was properly licensed. They could always link it back to your machine to prevent sharing the key and not using it.