Its fun to begin with but it gets boring. You can't really advance much. There are other fitness and activity games that can gowith the balance board. My favorite right now is Gold's Gym Cardio Workout. All you need is the Wii console and the Wii Fit System with the balance board. The kit includes the game.
I admit I do get on my Wii Fit everyday for a weigh in. If you don't, the balance board yells at you.