I owned the Coinstrike, but sold it because at the time I needed the cash to enter a comp hunt. I figured I would have some extra cash in a few months so I could buy another Coinstrike then.
Well, long story short, I decided to try the CZ3d instead of buy another Coinstrike. I lasted about 100 or so hours on the CZ3d diggin constant trash before I decided enough of this so I was able to buy another Coinstrike and later traded the CZ3d for a GTi 1500 and never looked back.
Now, I'm not knocking the CZ3d mind you, I think it did exactly what it was designed to do, which was hunt older pre-1950 sites, which I rarely hunt. I'm more of a park, beach hunter. I know there are guys who claim to find nickels like they were throwing them away, I only fond two with the CZ3d. Also guys claim they hit at hi tone and registered nickel on the 3d. On mine, nickels hit at mid tone and registered round pulltab, I would have to flip it from enhanced mode to salt mode for it to register nickel.
Now, you could say, that maybe I wasn't huntin areas where there any nickels. Well, I was huntin along side my wife who was using the CZ5, which was replaced by the 3d and she would average 5-6 nickels where I wasn't hittin any.
But then again it could have been luck.