Well, I have only had the AT Pro for about three weeks now, and have not had a chance to hunt it yet. I was planning to do just that during spring-break next week, but all of that went to he@! today. I wanted to play around with it a bit on some gold when I got home today, so I took her out in the yard to gb and lo-&-behold, it wouldn't auto ground balance. Stuck on the factory default of 80. Manually ran it down to 30 & tried again; "Nada", no sound from bobbing the coil & no movement on the display. So, I thought "what the heck", I'll still check the TID on the rings that I have. It wouldn't pick anything up over 4" (and I am being generous). I tried a couple of rings, a penny , a quarter, and realized that it just had no depth. I guess that I will be calling Garrett tomorrow. Ya know, it would be nice to be able to pick up a tool and use IT without having to "fix" IT first, before using IT!