Have 4 laptops on Win10, one on 8.1 and my own desktop ( + 2 others) on 7. Have a older twin tv tuner in there that , at the moment, doesn't play nicely with 10. Luckily the rollback work perfectlyWill one day bite the bullet and transfer the tv tuner to one of the other Win7 desktops and reinstall mine clean. Have the Win10 iso for that.
So far very little issues with any of the Win10 machines (touch wood)
Make a clone of the hard drive. Put the original drive safely somewhere.
Do the upgrade and test.
If not work. Put original back. If works. #score
Did it to a pc here at work
live long and prosper
I upgraded to Windows 10 on my home machine as soon as it was possible. I then upgraded my old work machine but got a new work machine soon after which I also upgraded. And I upgraded my wife's machine to Windows 10. Had no problems whatsoever...
Actually I lie! I had one problem on my home machine where the time would just change randomly. It turned out to be an Asus utility that was causing it. Otherwise it has been smooth sailing.