I'm still not convinced that any non-Surefire brand can hold up to the abuse a firearm gives the light over extended periods of time (and recoil, and being accidentally slammed repeatedly into walls, and being dropped on concrete and such).
I've had problem with every so-called high-end non-Surefire brand of light I've tried yet (and I'm still young to this flashlight game but I've tried a JetBeam, two NiteCore's, tons of Chinese deal-extreme lights which I wouldn't consider 'high-end', and have tried on weapons many other brands my friends own). Besides Surefire, nothing else has worked every single time without fail.
Videos on YouTube about flashlights really do nothing for me without extended trials being done with these non-Surefire brand lights. I hate to sound like a sourpuss here, and I literally don't currently own a single Surefire (sold them all recently) so I'm not a fanboy of them, but when talking about firearms it can literally be a life and death situation, and I would never trust anything but a Surefire simply because it has been abused on weapons by soldiers for years now and has the great reputation that goes along with this.
All this may be a mute point if this gun is for recreation, and will never be used for self defense or other dangerous situations like that, but I thought I'd add my two cents.