Well last night I hunted a very old school that has been hunted hard for years. I got a good tone, not scratchy, clear and deep . Was using thunder coil and 4 out of 8 sens . My depth meter was pegged and no screen readout. I increased sensitivity 2 bars and and solid 82-83 came up..I turned 90 degrees and lost most of signal to an iron grunt.. dug it and at the 10-11 inch Mark is a early teens wheaty. And of course the iron was close, a small bolt/large nail looking thing.. now I don't know how deep the standard pro is but the max is deeper than most of what I've ever used.. I've dug deep coins with my etrac and 705 but not as many as I have with the max and I've only had it a couple months.. that to me speaks volumes.. if you like allot of the gold but the pro tones, you will get used to and love the max.. my buddy and I both sold our other detectors once we did some testing and decided to make ourselves use the max only.. now I would never go back to what I was using..