Each machine has its good points. I certainly have a lot more hours on the Tejon than the Nauty, but 2 years ago I decided I should try a Nauty. I needed to see if it was true, what everybody says about them. I am not in Civil War country, but relic hunting and Copper Culture present some very deep targets. I was impressed with the Nauty, it would find targets that my Tejon could not in some places, but the opposite was true in others. After 6 months, I decided to sell the Nauty, but not because it wasnt deep. I sold it because it was big and bulky and heavy, and having a machine with knobs and switches on three different surfaces was not condusive to hunting in the woods with thick brush and branches. I found myself cussing the machine everytime something got bumped or changed. This machine just didnt "feel" right for me because of its physical properties. I also thought it odd that everybody that buys one, the first thing they do is remount the box below the arm cuff. Why the engineers at Nautilus have not stepped out of the past and miniaturized their electronics is beyond me. That machine could be made a lot smaller, lighter, and with a much better interface. It would kick rump then. The only reason the control box is so big, is to afford room for all of the knobs and switches (the inside of the box is mostly air). The Tejon is ligher and much esier to use. But that said, I think the Nauty is the better machine if you are talking about depth.