there are a lot of things that need to be considered when buying used gear. Your local dive shop may not be able to take care of the equipment that you buy from the inernet. Some warranties can’t be honored unless equipment is purchased from an authorized dealer which may not be the case when purchasing from the internet. these are the things that e-bay and other such sites don’t tell you. there may be some people who will get equipment from e-bay and other sites but the first time that they miss a dive trip because they had to send their gear away to have it worked on because the local dive shop can’t work on the gear they will return to the local shop.