Gonzo and Carlos are the best guides in Cayo for doing ATM or any other cave/waterfalls/Mayan adventures. I have been in Cayo for 3 months and used many different tour companies, including another to go to ATM. They have the best wealth of knowledge, the best methods for safety in the caves, and are all around great guides. Carlos is a fantastic photographer and had my camera the whole time in the cave, taking great pictures of the group and of artifacts. Gonzo is extremely intelligent and well spoken, clearly loves his job. Out of all the different tour companies I have used, RR is the most unique and the most knowledgeable. All the equipment was in great shape, didn't smell funny, and they changed the batteries in our headlamps in the cave to make sure we had the brightest light possible.