I have done the tour twice now and thought it to be just tons of fun and would do it again. We had 8 in our tour both times. It is both easier and harder than you might expect. Easier in that you really don't expect to be able to have the "machine" maintain your balance at all times, but it does, and harder in that you very quickly become accustomed to having the Segway respond to your slightest movements going forward and backward and then also expect it to do the same when you want to turn, but you have to turn the handle on the handlebar to go right or left. It doesn't read your mind.
My son was involved in the "First" competition for 2 years, started by Dean Kamen, who invented the Segway, so we have been fascinated with it for some time now. We had ridden one prior to the tour at a private residence over in Celebration, but found riding thru World Showcase to be a very special experience. I would not think twice about doing it.
I know that the tours have filled up quickly recently, and I would book it as soon as I knew I wanted to do it. They did charge our credit card immediately, not the day of the tour.
Regarding the comment made earlier about keeping you young, both of our tours had Guests from their early 20's to well in their 50's. The younger ones took to the Segway very quickly, no fear or trepidation whatsover. The older ones very, very quickly adapted.
Go for it, it is a blast.
