This is the only canopy tour that I know of which is actually owned by the guides. In a place like Costa Rica, it's always hard to tell where your money is going . . . a lot of times companies are owned by foreigners (or ex-pats) and even though all of the work is being done by locals, most of the benefits go elsewhere. Not the case with Original Canopy Tours.
Also, the guides themselves are so so so great. We had Jose and Johnny, both of whom were fantastic. Jose was learning to give the tours in English so he practiced with us a couple of times, but Johnny was fluent and so was our primary guide. The guides took pictures for us with our camera and Jose even took a video of the longest zip line (half a mile!) for us so we could have both hands free for the rope.
We also did a tarzan swing (basically jumping off a ledge while attached to a harness . . . quite a rush), climbed through the inside of a hollow Strangler Ficus tree, repelled down another huge tree, and saw a bunch of cool birds.
Jose and Johnny made sure we had helmets on the whole time and the trip was very safe, and I would recommend for any age.