Posideon Cyklon!! I bought mine almost a year ago and I wouldn`t trade it in for all the dive gear at my local dive shop. I`m getting ready to get a second. I have yet to have it give me any problems. It is a high volume regulator so the moment you take a mild breath your lungs are full. If a wave hits it when your snorkling you can dump 500 psi in a few seconds though. But then I just hold on to it when I`m snorkling out. A bit pricy, and the servicing can be pricy, but I`ll pay for it. See if your local dive shop will let you try one out.