I have tired it.
I like all the new features it has, seems more stable, tested on 4-5 year old pc and works smoothly
What I don't like is the design, windows 8 is clearly made for touch screen users (you will notice once u start using it.)
you can still use it with mouse of course, but without some features.

In other words:
you have a TouchScreen PC, w8 is probably best OS
Regular PC, I'd stay with linux.

Im not so sure, but I think the difference is that most distros let you go right to the net like in mac or windows, and this one kinda forces you to go thru tor network.