I have (had) one of these scopes mounted on a Mossberg 12 ga. It's my primary home defense weapon as well as one that I shoot friendly competitions with. Every time I've taken it to the range, I've had zero it. I finally just removed it and went to a fiber optic/tritium bead sight.
Pros: Easy to install
Cons: Doesn't hold zero
This review was written in the old system and had content requirements that are different than reviews written today.