the thing i've found..
i've been doing this since the first consumer previews and found that one of the issues w/ running 8 this way is that while it is nice to get the metro start on a seperate screen, when you use it, pretty much everything defaults to that screen, even after you move it to another. i haven't figured out how to get the items started in metro onto the last screen they operated. 7 does this. pretty much every time i start rdp or media center i use them on my largedr screen to my left. when i restart them, they always start on that screen. so far, not so w/ 8.