Originally Posted by
kensuf
I recently ran a CCR Cave Upgrade (crossover from OC to CCR) for a friend that is a fairly accomplished OC diver (~800ish cave dives, many of them exploration, used to hold the end of the line in Madison, Manatee, and Ginnie all at the same time, plus some very big mapping projects and a lot of deep diving).
Given that we had been planning on diving that weekend for a few months, and he and I had previously done some longer CCR dives (scootering to Sheck's Mountain, etc), we were very informal in the class, but I covered all of the material and skills in the CCR Cave course anyway -- I'm a by the book guy.
After the weekend was over, he told me he learned a few tricks during the course that added arrows into his quiver. YMMV, but if a guy like that could learn something during a few days of diving with an instructor...