As of today, I've ran 540+ rds through my rifle with this flashlight mounted. I have used Klarus lights mounted before and have had a good experience. I have used Surefire and Elzetta lights in the past, but moved to Klarus for the double tail switch. I much like the instant strobe on a separate button.
During firing the light was always on. I performed controlled 2-3 sec firing as well as rapid/double-triple taps.
I mostly have done day and some evening shooting... in between reloaded I checked the light to enter sure it was one; and sure enough it was one... During the evening shooting I did not notice and flickering... I plan to do some night time shooting, once a re-up on ammo.
The light has been mount at 1 and aligned with the muzzle... Overall I'm pleased with this light.