It will cost you $85 per person for about 2 hours. For us...it was well worth it. Allthough I have not done the EPCOT tour, I understand from posters, that the Fort's tour is much better.
The wife and I did the epcot tour a couple of years ago and really enjoyed it. Only problem we had was our own fault. We had been going strong for two days in different parks and the third day was the segway and epcot day. About half way thru the day we wore slap out and ran out of steam. Went back to the camper and took a nap. Us old folks got to pace ourselves.