I got the 4” coil to search some real trashy areas. I have found numerous coins and a couple rings where it was difficult to find anything but trash. This is well worth it!
I haven't used the search coil yet. I did a return on the metal detector I was going to use it on. But I plan on buying another detector that the coil will work on sometime soon.
I have already responded to this request along with a email conversation with Drew. It appears to be working fine on a air test. Not much I can tell you in the middle of February with 6" of snow on the ground. I'm certain it will work fine.