After doing about two dozen ocean dives I saw that other divers had those neet computers on their wrists so I decided to join in and get one for myself. I bought a slightly used Mares Tudor with SPG and hose on Ebay from a guy who had bought two of them, one for himself and one for his 15 year old son who had never dove before. He stated that the son did one dive and decided he didn't want any more. Anyway, that was five years ago and I still use this computer. Since it uses a AAA battery, I have changed that myself several times. Other than that it has functioned perfectly all this time. In the meantime I got a real deal on a wrist computer which I bought and use the two of them just in case. As an aside, when I got the Tudor in the mail and read up on how to use it, I went into the log and it had the one dive, date, etc. still on it. It showed the one dive of 95 feet. No wonder the kid bailed out. What an idiot this guy was to do that to him.