I do not have the Wii myself, but from my office co-workers what it comes with has a lot of fitness stuff, boxing, tennis, baseball, bowling, etc. You need a lot of controls that the basic set doesn't come with. They bought it Christmas when they had all the package deals going. I don't know much about the Wii fit, they have purchased that too, but from hearing them talk, I believe my $10 Jillian 30 Day Shred gives me just as good of a workout
I think kids love it, and so do adults, just can get expensive when buying all the extras.
"Determination isn't measured by what you do when you feel like it. It is measured by what you do when you don't feel like it."