Recently while on the Belize Aggressor, I did the "re-breather experience" offered by the captain. It was a brief description about setting up a Draeger Dolphin followed by an accompanied dive. It was actually less of a struggle than I had been lead to believe by several of my peers back home. After five minutes or so, I felt comfortable enough to meander through the canyons and swim-thrus. Having left my camera on-board, I began trying to approach fish as if I had a camera. While they seemed to mostly ignore me while swimming, they did become leary when I turned their direction as if to snap a shot, maybe to a slightly lesser degree than while on SCUBA.
My overall impression is that it may be great for shooting large subjects but may not be a big advantage in Macro. Considering the cost and additional setup time required, would it be worth the effort. I personally would not consider purchasing one but would rent it instead. It would cost around $550/week on the Aggressor for the unit, scrubbing agent, and Nitrox fills.
Has anybody used one for photography and if so what are your opinions?