I did the 2 hour tour on my last visit, and it was great! A little hot, out in the sun with the helmet on, but really fun! The first hour is just instruction, so I don't think the 1 hour tour would be all that exciting as it's almost all indoors, but the second hour you get to roll around the World Showcase before it's generally open to the public.
I would do it again, and only wish they had others, or that they did not require the 1 hour training every tour...