I bought this the other day - fantastic. Make sure you get a silicon cover as your feet do get sweaty.
Also make sure you by a rechargeable pack as the board does drain the 4 aa battery's pretty quickly
Now on to the board a fantastic - bit of kit and if you do the work outs properly - you do break out in to a sweat.
Just like with any weight loss regime it take dedication and hard work- but with the wii fit it is new and makes it a fun.
Go buy it
I cant wait to buy a few wii fit compatable games.