I just took my Tejon out yesterday for a change from the A T Pro, first time this year I believe. I also put that larger RSD coil on a year or two ago and barely used it. My observations after three hours yesterday after blowing some cob webs off the machine, and out of mind, were: It's the same deep machine that is sensitive to tiny bits that it always was. I can do a circle or half circle around an iffy hit until I get a better sound which I find advantageous with a DD coil in a field with iron nails etc, then test it with the other discrimination, to see if it passes that test also. I get more coverage than the stock concentric. I almost gave the coil to a buddy as a freebie, but we had a 4 and 5 pin difference between machines, so I kept it. But after yesterday I am feeling the love again. I don't think that I gave this coil a real chance before. And I sure liked what it did yesterday.