Using small coils and having these small gold detectors is like going out and playing bingo, using large coils and going deep is like playing powerball. I really think these small gold detectors will be a 5 minute wonder, maybe these detectors are coming out as the manufacturers may have hit the technology brick wall, these small gold detectors are on par with the vlf detectors available in the 1990's if you want small gold use a gold master, at least you get some discrimination.