Interesting. Game controllers are a fascinating user experience design challenge. While Playstation and Xbox controllers are fairly well-polished functional workhorses, I appreciate companies (like Nintendo and, now, Valve) pushing the envelope.

More than even the games (which, I suspect, will also mostly be available on other consoles or PCs), this intrigues me enough to want to get a Steam Machine. (Still, though -- that's a bit of a cumbersome name.)