I guess I should clarify the setting on the depths I was getting, Disc. mode and Gain at 100, Ground Phase around 48 - 52. Naturally, All Metal mode is deeper. While the G2 does very well in nails it does have a problem with coin size roundish pieces of iron and it loves the old crimp on bottle caps, both will give a good signal and will ID anywhere in the 50's to the high 70's. Most of the time you can use Monte's "Edge Pass Rejection" and tell if it is iron, but not always. I didn't even know I had the crimp on bottle caps in my yard until I used the G2.
I have an older, no longer made, Compass Coin Scanner Pro analog machine that does somewhat better in iron invested sites including the roundish pieces of iron and bottle caps and will, most of the time, classify them as iron on the meter. However, this older machine is heavy compared to the G2 and there is only 1 known person that works on them and it can take a year or more to get them back if they need repairs. When I go to these iron invested sites I carry both detectors.
On the G2 you really have to listen, as coins give a somewhat weak signal (signal is not very loud compared to other machines) , even in the 5 to 6" range. The Compass gives a much better signal and gets slightly better depth (1/2" to 3/4" depending on coin) but for all practical purposes they are equal in depth.