There is one in a pawnshop near me in Albany, Oregon for $600 I think. It's been hanging on the wall there for at least six months. It's air depth on a penny is only 8 or 9". Nobody seems to want it.
Yes, it's supposed to be a gold machine, but just like other people, I noticed that if a piece of gold is BB sized or smaller, it has a hard time detecting it past 4 inches. Maybe that's why nobody wants it.. It's very unstable too around other interference, and gets really weak volume once you approach it's depth limit. I wouldn't think it is a good relic machine because it didn't do well finding my pocket knife, Swiss Victorian pen knife, or my mini-multi tool either.
About 9 inches on the two little ones, tops, sort of embarrassing. My pocket knife only was readable at around 10 inches. Heck, even the lowly cheap Ace 250 can do that.