Tabwhisperer, as you know all machines have a tell if you can find them. The Makro Gold hits hard on all low conductors as you would expect on a 56kHz machine, it's not bad on high conductors either. Thin foil has a flaky ID while thick/balled foil, tabs, aluminum screw caps, nickels, rings, etc are solid. In the chips I don't pass up anything because it's easy digging and you never know what it is until you dig it.
One thing I found in air & ground tests is AM will give ID deeper than in Disc 1 or 2. You'll get a tone at the same depth in Disc 2 or AM but for some reason you get a ID deeper in AM.
One should ask whether hitting tiny gold, which is worth little in melt value, is worth buying a specific gold unit. I bought it because I provide a service as a member of The Ring Finders and I know first hand the Racer Gold will hit a sub-surface stud earring and the small 4x7 elliptical is handy in tight spaces. Since the Gold Racer has full discrim features it can double as a coin machine too for picking silver but it doesn't hit the high conductors as deep as other machines. Iron separation is really good too.