It will hang with just about any of the big boy (or big money) detectors out there. I hunt with a buddy who has a Minelab Entrac and he'll sometimes ask me to double check his signal with both disc before he'll dig. I love it, one of the best for relics! Here is a post from "another" site, I found really useful.
"I use the Tejon to the max.
I ground balance the machine a bit on the positive side. Once ground balanced never have to mess with the threshhold. In fact if you ground balance by pulling the trigger back, you don't even need the threshhold knob.
I hunt relics and set the lower discriminator just above the iron. I was setting the second discriminator on the pulltab and found lots of buttons but have now backed it off a bit. I leave the center knob clicked into vco. I run the machine hot, almost in the red zone, never, ever, below 10. This is one stable machine that can handle the 10 setting easily. In fact if you can put up with the clatter run it in the hot zone.
I can tell you for sure that this is one of the deepest relic machines out there, hands down. It easily out hunts my dfx. My dfx could not pick up a minnie ball that dropped to the bottom of a twelve inch hole and the Tejon was hitting it hard.
Two bits of advice. First put a large rubber band around the battery holder. The battery doors will open and your batteries will fall out, it happened to me twice. Radio Shack sells an identical, not close, but identical, the same used in your Tejon, battery holder. So, if you are near a Radio Shack stop by with your battery holder and get a spare, believe me you will be glad you did. The first time it happened I walked almost a mile down railroad tracks only to discover the battery pack was missing. Second time I was in the woods, but used my gps which I always use when relic hunting and backtracked right to where the battery pack was. Second bit of advice is to get a battery cover and detector cover that is made in England. This costs $30 and fits snugly around your battery box and completely covers your knobs. It has a plastic window held down by velcro, it makes the detector waterproof and it st ops accidentally moving the knobs, which happens all the time.
I suggested the Tejon to a friend who is a intensive relic hunter and told him about the inability of the DFX to find the minnie. He called that night and drove to Corinth, Ms. and had one that evening. He has not used his White's since. Yesterday he found seven buttons, two weeks ago he found two US beltplates. He is downright sold on Tesoro and constantly thanks me for the tip.
You will be amazed at the depth. One other point that I have found is that the wetter the soil, the deeper the detector goes. In saturated soil I can find minnie balls at over one foot and they hit fairly hard at that depth, and that is no bull. The Tejon is the best relic machine on the market, period."
Hope it helps! Did for me, Mike