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Yes the extremes, thanksrescuediver009:Are you talking about the Xstream's? If so I have neer used a cyclon but they are an awesome reg. Had one under the ice and.. flawless. Awesome air blast (more than jetstream) and reduced profile and weightof second stage. Then they design the first stage so that it does not need an environmental cap. Third there is a pressure relief valve built into the second stage. Quite nice if you ask me....