I'm Dan, the other person that took the class along with Peter. I thought the class was clearly the best I've taken to date. Duane is a great instructor, and as also amazing at how fast he can edit the video footage to include flaws in ones diving. The video gives an unbiased approach to showing just how much more there is to learn and perfect. I thought I had an effective back kick and couldn't perform under pressure. After reviewing the video with Duane and talking about how to improve I was able to visualize better how to modify the back kick before continuing to practice it wrong. By the end of the next day I felt like a stud again.
Tech aside, I would recommend his class long before recommending an AOW class. This class can actually teach you something that could make all your future dives more enjoyable vs. an additional 5 fun dives following an ego heavy instructor who has a poor set of skills to begin with. Just learning how to perform the back kick more effectively was worth the $250.00 let alone the other skills left to hone.
Duane as an instructor has a great teaching method and doesn't teach with the attitude that most dive instructors/ gods convey. He's easy going and has fun but will be serious and emphasize how mastery of skills can save your own life or one of your buddies.
Peter, just let me know when your headed back to the quarry, I'll add about an hour to your estimated time and meet you there if you want to practice some skills.
Take care,
Dan