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I have beening using mine with my benelli super nove 14" and have shot 3 1/2" and its still kicking i love the fact that the dot brightness self adjusts to light conditions and it weighs nothing.
I've owned one, but I sold it and bought a cheaper Burris Fastfire II. Aside from the on-off switch on the Burris, I can't notice any difference in quality or durability. Both have been mounted on VZ58s and M14s. They're really great little red dots.