One other thing I must say about the Cressi Archemedies is the computer interface completely sucks. It`s in essense a giant clothespin with metal contacts on it that must line up exactly on the computer unit itself. I have literally spent hours trying to download data from my g/f`s computer. Whatever computer you get try to find one with an infrared computer interface, it will make life so easy for you. Don`t let anyone tell you otherwise IR is IR is IR meaning you don`t need to spend an aditional $100 for a special brandname IR reader to download your computer. I paid $11 for a usb IR reader for my desktop computer and it works like a champ. If you look on ebay you can find everything you need to download whatever computer you choose at a reasonable cost. Whatever you choose good luck to you.