I finally got some time to try my F4 with the 4" coil today. What did I think of it you asked? Well I didn't like,I didn't think it was ok, I "LOVED" it. One thing I will say is the 4" is well let's just say it is very small. I never had or used a small coil before today & I figured the 4" would be small but man this thing is small. I found 6 quarters,a few pennies,several dimes (one was a 1943 silver dime),no nickels. Most coins were at around 3-4 inches, I got a hit at 6 inches telling me a nickel but it turned out to be a pulltab, but that tells me the little coil will get good depth. Great seperation & pinpointing. It got fooled by some of the flatened screw tops - they registered as a quarter but that can happen with any coil. I only went out for about a half an hour or so because of the heat but can't wait to get some more time in with the F4 & the 4" coil. I think I just might permanantly keep the little coil on the F4. Any of you with a F4 I highly recommend getting the 4" gold nugget coil. Steve.