I went with 2 adults, as we've made a point of doing every single disney tour available. I'd say in the 10-12 range would be on the outside of the ideal age group. Really, 6-8 is the sweet spot. If your kids are super joiners, and can have fun anywhere, this is a blast. Heck, I had fun. And, if you want some pretty cool pictures with (it changes, but we got peter pan and wendy) characters, and you want a 'free' fast pass to the pooh ride, this is a good tour. I can't remember if this was the tour that got us in to see mickey or not, but it might have been.
Basically, the tour guide reads off clues, and the kids solve the mystery. It ranges from simple things like "where does cinderella live?" To trying to find walt's statue. It also had a puzzle (as in pieces of a puzzle) in it, and the kids all did that. The guide was very good about getting the kids to break up the work to what is appropriate by age level, and to spread it around. It was fun, but like all disney tours, it really depends on the tour guide. The price is low, very low, and it isn't much of a risk if you don't like it.