You guys, these tour guides are good. We've been on more than a few tours in the past and they are typically good at a couple things (e.g. engaging tour guides, beautiful locations/activities, food etc) but have never participated in a tour that was great at all of them until now!
Harold was with us on the Arenal trip, and he definitely knows his stuff. In addition to checking out the rainforest there we went to a man-made hot springs that while it may not have been the "natural" environment we thought, was still really fun! (Younger ppl and anyone without a heart condition should try the water slides there.)
For the Nicaragua day tour, Mario was our Costa Rican guide assisted by David once we crossed the border. It was fascinating seeing an inactive volcano and hearing about the national history from two locals who were both personable and informative!
Don't question whether their excursions are worth your money, they absolutely are. Not only do we intend to return to Costa Rica in the near future, now we know to book exclusively with these guys!