LOVE THIS! Got mine at Costco, in hopes of getting back into shape. Comes with the disc, book, and "slime lime" zumba belt (where you put the controller while you dance/exercise). There are 40 different songs/exercises, ranging from warm-up, low intensity, med, and high intensity, and 2 cool-downs. You can choose by song, take a mini, medi, or full class - or create your own custom class! The more you play, the better you get. Get 10 "zumba" ratings in a row to trigger "euphoria" (screen goes all sparkly). Get 5 stars in some of the songs to open bonus behind-the-scenes videos! Keeps track of how well your technique was, time played, scores, and calories burned. Can have up to 3 other friends join you for a dance party! Burns calories faster - and is much more fun - than the Wii Fit or Fit Plus games! Here's a link to "Shake It" (low-intensity) on youtube:
http://www.youtube.com/watch?v=vb4SxxV_qIU
LOVE this game - use it everyday. I've lost 4lbs and 3" off my waist so far (I'm lazy and only burn 300 cal/day).
The only thing I would have issue with is I NAIL some of the songs, but can't get 5 stars on it. I'm blaming the room lighting/plants in the way though.
Would recommend it to everyone!