I purchased one for my Beretta Xtrema 2, have not had a chance to really try it out yet, however the few shots I took were all dead on, turned it off, and tried using it with out the red dot, no issues there either as I could still see my brass bead. I have to get out to the range to try it with clays and see if it hinders my ability to hit them, or will it improve my hit to miss ratio.....
I got mine from LeBarons, they typically will no longer stock them, you need to make an order and they will get it in for you
I like the way it mounts to the shotgun, ti made no change (for me) to the fit or LOP as far as I am concerned, and it's nice and snug, and almost looks like it should have always been on the shotgun
if there is any interest I can take a few pictures and post them