I love my alternate air source. I used it buddy breathing on a Rescue course and had no problem but that was in shallow water and I didn't have ascent problems. The reason I like it is simplicity. I'm an avid underwater photographer. Note I didn't say good
Anyway, one less hose is the best. I use a back inflate BC so it wouldn't vent in an ascent. I guess I will have to use my teeth to hold the mouthpiece wile I vent with the shoulder dump. I realize that might be a future problem but I'm not switching. As I said, I love my alternate air source.
