I've one installed on my AR, it works great at last 3gun match. But, I only have 2 complaints:
1st, the front allen screw head stripped on me (after serveral times of mount and dismount, I guess I just went to tight on the front allen screw) I don't think you can get those screws at local Home Depot or Lowes.
2nd, I wish the brightness can have 2 more higher settings. I was having problem engaging the targets when the sun is directly above you. Maybe they have some kind of hood or cover. Overall, I love the sight. [marines]