Aqua lung is the best to buy used all parts are still around even for the oldest gear they made always be careful buying used as last mounth i bought a regulator that had very bad salt damage the man said it just needed anual service which he also stated it was working fine as i found out it would not work at all and it cost me almost 100.00 to service because of damaged parts just rember that if you dive salt water wash the stuff off at the hotel after a bunch of people use the dip tank by the end of the dive day its salt water not freash so becareful buy aqua lung gear it save you lots of head achs even the older stuff is ok they dont breath as nice as the new gear but its all what you can afford