Until you've missed once. I love it. I live in shotgun only Deer zone, change to a improved Cylinder tube and go. Nuthin to line up, put the cross hairs on and shoot. Not crazy about any type that requires a battery.
Sight in with cheap slugs, then conferm with high $ Turkey load.
Here's a couple pics of my Browning with a vent rib mount that I made while the boss wasn't lookin.
http://img.photobucket.com/albums/v3...Picture469.jpg
http://img.photobucket.com/albums/v3...Picture471.jpg