My boyfriend bought a wii a few months ago, and he bought wii fit as soon as it come out. Wii fit is fantastic- I could spend all of my time on it alone. The good thing is, he had it at his flat for the first few months, then he moved over to my place so it now lives here (and I didn't have to pay a penny!).
Unfortunately, he has also now brought a playstation, and Xbox 360 to live here as well, which he spends a lot of time playing on- so I have to fight to get a shot on the Wii.
He got Guitar Hero last week for the xbox, and I am very bad at it.