GPZ 7000 is certainly a fine machine for the gold fields and maybe relic hunting in highly mineralized soil, but it is big and heavy and not suited for general coin hunting or water hunting. Just because it is one of the most expensive machines out there doesn't make it the best machine for many hunting situations. It is a PI machine with no true discrimination and really designed for gold nugget hunting and little else. Were I a gold nugget hunter I would definitely like one (out of my price range) but for the coin and relic hunting I do it would not be a good choice at all.