After waiting and watching (this forum) I finally made the jump to a 10by12 sef ..Arrived today noon and on the v by 12:30. Air test and it will hold rx at 15 but with the boost it overloads. It can hold with rx at 12. Does this sound like it is a good coil? I took it to an iron infested beach that I have been working hard with the 5.3. I felt the new coil could handle more gain but no real targets to work with .I and others have hammered this site. I did manage a small stone with what looks like natural gold but I am skeptical . Next went to a local park that has also been worked hard over the years and managed a gold ring (small gold ring) at 6 inches and almost beside it two gold clad blings. Also an Indian that was a surprise. Overall I am quite happy with this coil but if it could be bitter , why not? Another question what coil setting does everyone find most accurate for depth? The 10 dd setting seemed to read deeper that the target. Bill