Just installed. I have to say, I like it. It’s all Windows 8.1 but the Windows Explorer is more Windows 7. It has only been a few hours, but I’m doing fine on my Lenovo Yoga 2 Pro.
The killer feature for me is the implementation of virtual desktops. Apple never got it right and the various applications for OS X and Windows never really got it right. If you are used to the flexibility of the GUI in Linux or Solaris, you miss this when you don’t have it. The ability to keep applications open and maximized but off into their own desktop for organization is just such a great productivity aid.
So far, so good for now.