The redundency I think is needed as I pursue deeper diving experiance, plan on doing adv. nitrox and deco procedures with a TDI instructor. From what i have read and been told the Aeris will do this, I will be sure before the purchase though.
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shugar:i made a reservation for an orange one (their last piece) but told them that if somebody was going to buy it right off, then i'd settle for a yellow...