I think the Wii Fit is great. However, it's just like my trips to Curves or any other exercise regimen, for that matter: the hardest part is starting. Once I'm at Curves or on the Wii Fit, the rest is easy because it's fun. The key is keeping up the discipline to do it. My goal is Curves three times a week and Wii Fit the other two week days and one weekend day. Wii Fit is great because it keeps you motivated, "talking" to you and encouraging you. There is enough variety of activity that you won't be bored including yoga and balance games, which at my age are important.
J.