D.P.
I got Wii Fit for my birthday in November. It's a lot of fun and it IS a good way to workout when it's convenient for you. There are also other Wii fitness games, not just Wii Fit. My friend like the Biggest Loser (?) O. the best.
My problem is remembering that I have to actually turn it on and DO it! :-)
It you are motivated and disciplined, it might be a good idea. But if you already have a VCR or DVD player, then so would any of the workouts available! The Wii Fit does weigh you and keep a chart of your loss but if you don;t want to spend the money just buy/rent some DVDs and see how that goes for you.