Just installed it. Whoa! I love how MS got rid of all the unnecessary crap. I'd like to see MS Office based on Metro.
Windows 8 is a fresh take on the UI, assuming you use the new UI. I like the competition it provides the OS X and iOS. I do admire MS's approach with the Metro design language, but I don't think they took it far enough.
I used a preexisting bootcamp partition. Since I put it on my older MacBook, I had to use the 32-bit version. The 64-bit version would not load.
I wanted to use VirtualBox, but neither version of Windows 8 would install. Perhaps better luck with Parallels or VMware?