I got this reg (SP B/A 109) today; I can see why there are lots of die hard fans of these old regs around. It's really built...looks like a large person could sit on it and it would still be okay. Plus, the metal casing is much more aesthetically pleasing than a typical plastic casing. I'm a little concerned about the weight, though, it's pretty hefty. Someone please tell me that in the water, with the right mouthpiece, these things are comfortable to dive repeatedly with?