Its worth it. Even on my old junk bucket PC system now work so much more stable. Imagine what will happen with Pro and Enterprise full versions with Directx 12 and brand Nvidia videocards!!!
I will still wait a few days to see what kind of bugs Windows 10 has. 7 just works so well I am afraid of another let down like Windows 8 (I have 8.1 on my laptop and it is simply awful).
Work on pre-tech about week and half.No problems. Will change to Enterprise/Pro later. Windows 8 really was a mess like Vista. Well-with Windows always like that -one is great, but next is a failure and stepstone to further perfections.
I have 3570K @ 4.3 ghz and gtx 780 @ 1110 mhz. Stuttering lessened for me, even in Novigrad. Also, when I played the game in full screen, my second monitor sometimes turned all black. Now, it does not happen anymore. So far, I'm very happy with Windows 10.