My wife and I did this in the summer of 06. It was $80 and well worth the money. You will have a blast on this tour. They show you a movie and then you have to do some indoor practice on how to ride the segway. After that you head out on your tour.
Took my wife and me about 5 to 10 minutes to get the hang of it. Like I said I would recommend this tour for anyone. It is nice to be in the world showcase when it is not opened up. It is a peaceful tour and you will learn some interesting things.