I have a scubapro 25 600 reg and love it -- never a problem, smooth breathing, no flooding in an upside down position. My dive buddy needs a new reg and is debating between the 600 and 650. Can you tell me the differences which might help him choose? Thanks, Jeanne
LeisurePro S In the X650 the valving for both inhale and exhaust are different from the S600, theoretically giving it higher performance. On the other hand, from our experience most customers prefer the standard design of the S600, and being more popular parts will be easier to find in a pinch.