jimmiej - Thanks for posting the picture! I'm sure it will be a lot of fun! I'm definitely signing up my DH and Dad! Thank you everyone for sharing your experience. I don't know how I'd plan a trip to WDW without the disboard!
Thank you to everyone who posted - I called today and booked it for the day/time I wanted for my DH and Dad! Also, got the AAA discount. You guys have been so helpful, if it wasn't for your feeback on this, I probably wouldn't have tried it!
Robb Alvey has a video he took while on a Segway at http://www.sharktums.com/segway.zip . He has some great videos of WDW and other parks at his website.