Mine came in and I eagerly put it onto my sidearm.  Bright light, easy controls, I was happy.  I go out to do some target shooting, and after 150 rounds the light fails to turn on.  I replaced the battery, but that isn't' the cause of the problem.  I shake the lights and hear something rattling around inside of the housing.  Save your money and buy a Streamlight or a Surefire weapon light, I wish I had.
Pros: Nothing.
Cons: Cheap, unreliable.
                    
This review was written in the old system and had content requirements that are different than reviews written today.