I'm using it, It's working just fine. Although I do keep getting an invisible icon that when clicked launches a couple of random windows apps, usually shop and settings. Other than that though, it works just as well as in previous windows versions. (Although I don't use the tabbed dock, so I can't comment on that).
I get the same invisible icon, its annoying, I have to click through several windows apps to make it go away only to have it reappear 10 minutes later...