8.1 has been good to me. im sure it has its issues but so far knock on wood i have only seen inprovements in performance. and the overal load on my box is alot lower. boot times are way up even without ssds so overal i like the feel of it. it has a lerning curve no doubt but once you get how to monuver threw it, its actualy a nice system. i have one system on windows 8.1 pro and my other is still on 7 pro both 64bit of course. so i run side by side tests. so far 8.1 has given me some good bumps. you can always go back to 7 lol.