The separation is much better than on the EXCEL. I got a 1955 wheatie to read at '+27', a 1980 penny read at '+28', a clad dime reads at '+29', and a Mercury dime reads at '+30'. A post 1982 Cu-Zn penny reads at '+21' as does some varieties of aluminum screw caps. A clad quarter reads at '+33', and I don't have a silver one handy, but if it holds true to pattern it will read '+34'.
On the lower end a Jeff. nickel read at '+10', as did a rectangular tab, but a round tab read '+13'. I had Buffalo's read from '+7' to '+11'. But this is in the air. I suspect in-ground there will be some separation between nickels and rectangular tab due to corrosion and halo; plus older nickels will be deeper, so that is an aid in deciding whether to dig or not.
Took it to the beach and set it up like this; did a ground balance as far back as possible from the waves, and the ground still be moist, and I raised Discrimination to '-18', and it worked like a charm. That method is what you call a double ground balance. It worked as well in Disc. as it did in All-metal. Piece of cake!
In differing areas you may have to run a little more iron discrimination or, possibly get by with less. There should be no problem running it all the way to zero, because you will still hit the thin band Gold rings. But Platinum can read much lower because of alloying metals.I have found some Platinum rings to read in the iron range, close to the boundry with foil.