It's a fast dual-head box. One screen is all Windows (and I'm typing this from IE 10), and the other is xmonad and emacs on Arch Linux on VirtualBox.
I'm also an Apple user (and AAPL shareholder), owning two (2010 and 2011 model) MBPs, and it is my opinion that Windows 8 is gorgeous and very, very stable. Microsoft has finally simplified the desktop experience, with sane security defaults, and in my opinion are very close if not at par with Mountain Lion on ease of use and attention to detail.
Finally, the system's performance as a desktop machine is at least %25 better than Unity/Gnome 3/KDE, and the overall fit and finish is years ahead of any leading open source DE. It was the Desktop Linux experience that has encouraged me to look elsewhere.
I'd encourage everyone to keep an open mind wrt MSFT. They're on the right track. This is not the same company I grew up hating.