Very good. Mine seems to be good. Using the Fisher 10" stock coil, 50, 10, -3, a silver quarter looks good at maybe 7 inches.
Cranking gain up to 80 gets about 8 inches.
11DD coil adds an inch or 2.
Mine's the older push in connector model.
Just got back my F75 from upgrade, I was remembering wrong how the F5 was. I thought it was better.
Thank you!