Haven't played it and I don't think I will. I've played the Wii a bit and it just doesn't do the traditional controller any justice.
Alterraun Verner says it's great. I can't afford it to simply try, but I hear much of the same we heard with the wii at first. Fun, family, party games. I want it just so I can do the 'Poison' choreography. BBD!
I played a little today at Best Buy. It was pretty underwhelming. This whole motion gaming phase just isn't my thing though. The Wii is fun when i go to my parents' house and the whole family is there, but that's the only use I have for it.