Just finished the classroom/pool portion of the PADI OWC. It was Great! Didn't have really any difficulty with the skills. The hardest part was getting used to all the new sensations(hearing, communication, ect.), and buoyancy control. Had a small class of 4 with an Instructor and a Dive Master. Got to practice all the skills several times which was great, and had extended time to practice buoyancy. I am going to Cancun in 2 weeks and wanted to do my Open Water part there. Can anyone recommend a PADI shop in Cancun? I can see how this could get to be addicting and I haven't even been in the ocean yet!