I'm a win10 user these days and I miss 2 things about 8.1:
1) metro UI, with the ability to design your own tiles.
2) 8.1 can nudge alot abot insralling upgrades, but win 10 will force you to regarfless to what you want. Some security upgrades will be pushed on win 10 with the only option to choose when to restart...
Other than that? Yeah...I love win10.