I've had this for at least 4 years. I've used it on 3 boat trips and a few day boat trips. All my gear is very well maintained. There are some scratches on the screen protector but otherwise this computer is clean. This does not have the quick disconnect. It does do nitrox. I recently went to hoseless (thanks to another SB member) so this one has to go. I'm asking $300 plus $10 for shipping.