Yes I am. Dual booting with Windows 7. It's a lot like Windows 7 with the addition of the Metro UI which is more for tablet PC's/touch screen but works fine with a mouse and keyboard. Stability and performance is great! Boot time on my i7 notebook is incredibly less than 2 seconds!!! It's about 7 seconds on slower computers. Boot time on my Windows 7 system is about 25 seconds. Sleep takes about 4 seconds which usually takes at least 15 seconds on Windows 7. That way if you accidentally send your computer to sleep and need to quickly wake it up, it's only a 5 second wait. The new Visual style is great. No more Aero stripes and I really like the thin scare borders. Other than that, applications load faster and CPU/RAM load is less than in Windows 7.
Regarding Metro applications, they can only be exited via Task Manager. Alt+F4 does not work and there is no close button. Metro applications simply go in a freeze/suspended state and consume very little RAM. However, having several Metro apps open can be a problem when Alt-Tabbing through all the applications you have opened.
Overall, I think it's a great improvement over previous versions of Windows. Faster, friendlier and visually appealing. Users won't be lost because it still looks and feels like Windows - especially when not using the Metro UI. I hope that they will add the option to exit Metro apps but doing it through the new Task Manager is quite easy.
Looks like a few people beat me to it. There are at least 3 utilities out there that can toggle between the classic Start Menu and the new Metro UI. So I guess I won't need to do this after all. Oh well!