The thing I don't like about the air controller I have is that the center pin in it seems a little too long. The result is if I tighten the delivery device down too hard it puts additional pressure on the Vamo center pin, something I try to avoid. Between that and the air control ring being too easy to turn, resulting in no air flow when I least expect it, I do wonder if there is any advantage to it at all. Incidentally, I bought the air controller from a reputable vendor and kind of expected something a lot better.