The dance pad arrived two days ago, and my dad picked it up at the post office while I was at the football game. I played until 2:00 in the morning, and got up after 6 hours of sleep to start banging on it again. I'm insanely obsessed with it sweatdrop .
It's one of those thick USB pads that have a graphic that looks like the DDR arcade pad with 4 additional diagonal arrows (I haven't tried anything for that), but so far, I've found it's a joystick in which you must configure Stepmania to the arrows. It was an incredibly simple process, and would encourage any Stepmania player to get a pad. It's just not as awesome with your fingers... and if you've played only at the arcade, you'll realize how much you suck without the bar (*realizes I can only pass Max 300 with the bar*)/