i myself do not have the resource or the funds to obtain one, I see them being used, and i would do some research, i saw some videos on YouTube i guess some miners use them to map the bedrock finding the natural riffles.
You would be better off spending that kind of money on a gpz 7k, or gpx6k with the new 900 and a monster, or a 6000, and the rest on tools to help you get there. please don't spend that kind of money on a piece of plastic that will not work.