I like the MX5 better than the MX7 even though it doesn't have 'Trac Lock' ...the automatic Ground Balance keeps up in my soil and it worked well in Wells NV ghost towns. It is almost as good as a Tesoro in the small ferrous infested areas around old homesteads with the 5.3 concentric coil. I set mine up in Coin Mode: Sensitivity at 8: 2Tone: All Metals Acceptance in Disc. Mode or the the first two bars of ferrous notched out. With a slow and methodical sweep speed, it will pick out good targets in the iron nails.