Started reading this thread, and from the first post I qualify as a dive pro.
My name is Richard Huntrods, but have been using 'sunnyboy' on numerous dive forums for many years. Originally from Calgary, now living on Vancouver Island near Nanaimo.
I've been a SCUBA instructor since 2010, first with SDI and now with PADI. Our dive shop scheduled the Digital Underwater Photographer course a couple of times, but have not run it yet.
I've been taking photos since I was a kid (Kodak box camera, then Roliflex twin lens), but moved to SLR in 1974 when I bought a Voitlander. Since then many varieties of Canon SLR, plus several odd and unique film cameras. Started with digital in 2000 with a Kodak model (one of the first), then a Nikon and finally a Canon DLSR.
I started taking underwater photos in fall 2003 with a Sealife unit, then bought an Ikelite housing for a Canon A570IS, which I used until a few years ago when I upgraded to a G16 system. Lately I've become a total newbie again when I bought a Canon 7D and Nauticam housing. Diving with a DLSR is more like "a camera diving with a diver attached" than my previous rigs, which were definitely "Diver carrying a camera".
I tend to take a camera on 99% of my dives, because whenever I don't take the camera I regret it. :-)
I also take some go-pro (clone) video when scootering, but our visibility has been so bad lately that it's all pretty much just ... green.