I've been playing with the new Preview and it's much better than the Developer version from before but I still don't like it over Win7. As someone mentioned above, it's small changes on top of Win7 that make it better but for me personally they've missed a few tickboxes as far as Metro goes.
I have dual screens, I like widgets and being able to move open apps permanently to my 2nd screen set in portrait orientation. I like the idea behind Metro but not being able to organise a logical Start menu in Desktop mode is a major kick in the teeth.
Yes, it is change and "par for the course" but it's not logical. They're forcing a touch screen interface on users that don't want anything to do with touch screens.
If MS had allowed you to at least organise apps into folders in Metro when you right click to view all apps instead of just showing all apps on one scrollable screen then I might have been fine with that because the screen transitions switching between Desktop and Metro are rather pretty and pretty things please me.
As it stands, it's a 2 step affair now whereas with Win7 it's one step.
I want Firefox? Sure thing, on Win7 I click Firefox and it opens.
On Win8, I click Firefox on Metro, it opens the Desktop app then loads Firefox. A 2 step affair. I don't want this. I want a classic desktop with a Windows 7 start menu that I can search, organise and manage my apps.
FWIW, this preview has been running on VMWare Player on my Win7 OS SSD, no slowdowns, no problems whatsoever and hardware acceleration works just fine. I'm happy with the performance, everything is so slick but the things I mentioned above affect me as a power user.
Now, unless I've missed something here then I don't think I will be upgrading to Win8 and wait for Win9 with hope that they have some sense restored as far as proper desktop PC users go!