I use just the standard F75, but I use the small 3x7 coil all the time. I hunt a lot in the trash and it works very good there. I get a dime at about 7 where I live, the old cz5 is a little deeper. You just have to us a fisher for a while to learn it. They do go deeper then other detectors for me. And I have had all the types of detectors. I'll never forget one time I had a etrac with x5 coil and went over a spot 3 times and then went over it with the F75 with the 3x7 coil and got 3 seated half, it was very trashy..