I finally got to experience what I've read about so often. We were hunting behind my mother in law's house, a site we've worked over pretty well but this time with small coils. I put a 5x8 DD on the AT Pro and it was like putting on new ears. Formerly scratchy, obscure gibberish suddenly transformed into distinct, understandable messages. I could waggle in a field of rubbish to find figurative diamonds in the rough. Ok, enough tortured metaphors. Hunting around an old well right off the back steps in an area we've searched and searched, I caught a distinct, solid, but very faint, high tone. No number, no depth. Confirmed it several times then got out the spade. Because it's Jen's mom's yard and she couldn't care less, I dug a wide plug so I could get my coil into the hole about 4" deep. Now I was getting 86-88 at about 8". Deepened the hole to a foot. The soft ground gave way to hard clay below. I got out the pointer and got a strong buzz all the way around the bottom. Now I was disappointed - I had run into this situation several times in the last hour because I was up against the rebar of the walkway. I thought this was going to be the same ruse and even thought of filling in when I took one last brush with my hand at the bottom of the hole. Staring up at me was a beautiful, tiny, silver disk. Not a spectacular coin but the first silver I've dug and most satisfying in that I followed an obscure but telling signal. Love the 5x8 DD. Much better information in the noisy sites we seem to hunt and also very easy on the arm.