My MXT with the 12X15 SEF coil was a button magnet today!! Pulled out 8 buttons, 1 Conn. copper (toasted), 1888 IH, and a couple whatzit's. This spot has been pounded for a longggggg time, but I went slow and listen in between the iron signals ( even with this big coil you can separate GREAT!!). i took this coil in a trash area last week ( same place) and still pulled out stuff. I will admit it's noises, but it works.