I have been using the AT-Pro since a few months after it was released. I have owned 6 of them. Bought 2 new, the others I got incredible deals on so bought and resold. I would put my hours of use and skill level with this model up against anyone without hesitation. It does depend on soil conditions, but average is 7"-8". That is average...there are exceptions. I pulled a quarter at the waterline of a freshwater lake at approx 11-12". I can also reliably hit quarters and large gold rings buried at 8" in dry freshwater sand. Dirt is a different story....6"-7" is about the average. Now if you are just talking that you detector sounds off but no VDI to indicate what it is then it does go alittle deeper then the numbers I stated. My numbers are for solid hits that the machine identifies properly. Some MAY get a little hotter machine, but I have had 6 like I say and that is my experience. I LOVE this machine, look at my Signature below. I own the "Supposed" Best detector on the market (I say that with great sarcasm) and it is up for sale. Yes sir, I will gladly and prefer to run the AT-Pro over that other. That "other" machine I own will go insanely deep but at a cost of big money, alot of weight, and slooow reaction time (compared to the AT-Pro). There is no One perfect detector for every condition, but if I could only own one it would absolutely be an AT-Pro!!