I bought a smart cycle for my son. The unit worked for a few days but then it just quit working right. The picture was obscured with horizontal snow (mostly black with a little white) and the sound was liek it was in slow motion. I've nerver heard a electronics do that. Maybe a record player or cassette tape. Considering the lack of moving parts it was odd. Anyway I called the 800 number and they advised to change the batteries and if that didnt work to call back. The next day I called back and was advised that I could send the green cord back and get a brand new unit. The only thing was that I would have to wait 2-4 weeks. I decided to just take it back to Walmart and get my money back and be over it. I am very happy not having to deal with this issue anymore. But I still think it's a great concept that Wii is close to.
Here is a version for adults:
Cateye Interactive Game Bike: This is what you get when you turn a standard stationary exercise bicycle into a game controller. The $400
Game Bike hooks up to a PlayStation 2 and allows you to use the pedals and handlebars to control any racing game available for that console. You can even hook up more than one Game Bike to your PS2 and race head-to-head with another player. The faster you pedal, the faster your virtual vehicle goes. Now that's one slick way to kill two birds--getting your Project Gotham fix and finding time for a workout--with one stone.