Well all I can say is I think its a winner. Went to a super trashy old house today that I have already hammered and was pulling out some buttons and odds and ends that I was not able to pick up in multi conductive. My theory is that with the proper coil and swing technique and maybe your angle of attack you can find anything in multi tone conduct. 2 tone ferrous is just fool proof and I can swing without thinking that I am missing anything. The machine is just super fast and that is what you need combined with a semi slow swing speed. jmho HH Joe