I own the Zoop, purchased 5 months ago. Put 60 dives on it, and now I want to sell it. I will say it has been reliable. But if you are only going to do occasional recreational diving then it is fine, but now I am ready to expand and the Zoop is not sufficient. Keep in mind that Zoop is very VERY conservative, and you can not really do anything about that. I would say it is pretty much only good as a rental. For recreation you can get something cheaper. Also, I have been having trouble with the dive manager software. One more thing, it claims to use a RGBM but then why does it not have me do midpoint stops on deep dives (> 100ft). Is that not an attribute of the latest RGBM??