The light is great, all the function work good. Now to the downside, the on-off tabs are crooked, and one side is almost touching the trigger guard. It works but looks odd. The mounting system is very flimsy, the screw is very hard to push through the picatinny bar tab and the 2 springs are useless, one popped out and I never did find it. I think Holosun needs to revamp the mounting system before I'd buy another.