I have a Tesoro Sand Shark , It's a great machine, I have had some great finds with her. But I'm looking towards the futhure. O rings for the electrical box are pretty none existance. It still like new shape to me. But I'm thinking of replacing her. Looking at the Garrett Sea hunter ii, another Pi machine. But i'm open to other newer machines . I did look at a Nox 600 and a 800. But I have heard not so good things about them, Batteries are hard to get, some leak. The big one i'm looking at is the Excaluber 2. But there again I read a lot of not so good things for a machine in that price range. Knobs break off easy, Battery life isn't that good. They need a lot of constante maintenance. I don't own one , it's what I read. not knocking the machine. I would appreciate othere's insite. Thanks.