No RB is idiot-proof. You do not have to calibrate Dolphin, but you have to choose the right orifice and check the flow (PITA).
I think any SCR is a waste of time. Dolphin, especially, the buoyancy characteristics suck, WOB sucks, predive procedures/assembly are pain, and it blows bubbles. The Sports Kiss would be a great alternative and it gets you on the right track when you decide to move up to more advanced diving.
I think any SCR is a waste of time. Dolphin, especially, the buoyancy characteristics suck, WOB sucks, predive procedures/assembly are pain, and it blows bubbles. The Sports Kiss would be a great alternative and it gets you on the right track when you decide to move up to more advanced diving.