Bryce, I have had two XL Pros and one M-6. In my opinion, the M-6 is slightly deeper, but not by much. The deepest silver coin I found with the XL was about 7 inches and maybe an inch deeper with the M-6. Some might call this a wash and maybe so. I did seem to find coins slightly deeper with the M-6. What I found with the M-6 is I consistantly found nickles at 6 plus inches which is something I never did with any of my XL Pros. Tone ID is nice, but I would not give up that super smooth audio and super accurate meter for the M-6. If you do buy a M-6, hold on to the XL Pro until you see if you like it. If I was a rich man, I would have 4 detectors, an Explorer, a CZ 70, a Tejon, and a XL Pro. I have a CZ 70 and a Coinstrike(love hate relationship with the C$) R.L.