Absolutely awesome. Not that I use many of the metro apps, people and calendar really, but having them as proper "Windows" applications rather than "Window" apps sets right what MS made wrong.
Anyway, I've noticed that my WindowsFX open/minimise/maximise/close effects don't seem to apply. Window momentum dragging and window flicks work as they should.
Using:
Win8 64bit
WindowsFX 5.1