Just done the upgrade to WIN 10 Pro from WIN 8.1 Pro and it went pretty much as claimed, I had to reset the audio output default for the speakers and reload my printer drivers but that's it.

It appears to startup quicker than 8.1 and the annoying intermittent jerky mouse appears to be resolved as well.

Over the weekend I plan to have a bit of a play around with Reaper so we'll see if the ASIO drivers are still in place but once again no biggie to sort if they aren't.

It too about 6 hours to back up the important stuff on the C drive ( which hasn't bee required because nothing was lost ) and about 1 hour for the upgrade.

All in all a happy camper so far.

Remember: WIN 10 does report keystrokes, browsing preferences, location services, voice recognition & facial recognition back to MS so make sure you turn these off in preferences