I have a MXT & use the 6x10 dd coil most of the time, i have been hearing alot about the butterfly coils & hope someone out there has used both types. Mainly what I am looking for is a coil that will go deeper than the 6x10 I had a 12" coil & it didn't seem to go that much deeper than the 6x10. I tried the 12" several times & never liked it because of its size.