Arriving real late to the party here but count me in as a happy CZ-5, CZ-7a Pro user.
Horses for courses as the Brits say, I wouldn't grab a CZ for Ghost town sites, heavy iron contaminated demolition sites, Etc.
Used on beaches including salt, hunting open less trashy sites, verges where there was some but not heavy traffic, old parks it got me quite a few choice targets including my nicest gold ring. Switched to Salt mode inland they reliably high tone on our Canadian clad, hit on gold & silver to pretty decent depth, and flat out vacuum up nickels.
I use mine in 0 disc or AM mode exclusively, rotate around targets for the right sounding cross sweep, and like the modulated audio on deeper targets.
All that said I was not a fan of either the CZ-70 Pro or CZ-3D 4 tone models, the extra tone just did not have sufficient separation from the standard mid-tone to add anything as far as extra tone ID capability, I just dug more aluminum trash.
After a long period of hunting with the CZ units I began having that "Tesoro epiphany" where I could say to myself , that mid-tone is kind of flat and sharp resounding, that will be aluminum, gold produced a "rounder, fuller" saturated audio response. I think many times the number of hours behind the coil on a detector develops a certain "Deja Vue" effect in an operator where subtle little "tells" come through the headphones that only become perceptible over time.
Let's call it "The Tesoro Effect".
And, as to ergonomics hip mount and have at 'er.
Hunted with the CZ-20 chest mounted here in rainy coastal BC many happy days to good effect.
Oh yeah, blaring VCO pin-point, not a fan of that feature either.
Cheers,
Drew.