Another thing that comes into play is the detectors ability to find good items around trash, what would be better a detector that can find a BB at 2 feet but can't tell the difference between a piece of foil and a Bust dime? Or a detector that can only see the BB at 8" but knows there's a penny 2 inch's away from the foil at 6". I have detectors that go really deep great when I am in the woods with little new trash. But when I hunt a yard or a deep woods site full of trash I could spend all day digging garbage while detector 2 digs all the good stuff at 6". So depth is not everything. Sometimes the only way to tell a good detector is to use it. Reid