Yes, it works fine until you add dancers. When you add dancers, it crashes in attract mode. This is apparently some known glitch with Stepmania 3.9 or whatever the hell the Xbox version is running.
There's some torrent out there with a bunch of the song packs, and some Spanish youtube video that links to another package of it.
Far as I could tell, it was identical to the PC version but I haven't tried it in widescreen yet. Again, no dancers, though. Which was half the charm for me.
There's also a few legit and a few questionably legit DDR Xbox games out there...