I like the basic design of the Copper John Dead Nuts sights.......I didn't care too much for the softness/durability of the aluminum used. I never had mine move within the Dovetail that I can recall, but In very little time I had the vertical bracket chewed to shreds sighting in different arrows, bows etc. In 1/2 season it was trashed to the point where the screw in the vertical plane won't slide freely anymore. The washers on the screws are badly misshaped and all the screws have rusted worse than any I have had. The fibers on the pins seem a little more susceptible to damage than most as well. Mine looks like I had it for 10 years.
Other than I liked it just fine.

Finally broke down and picked up a Spot Hogg "Real Deal" .....the name fits.