Hehe, I like Kai's honest review.
"Excellent price for the performance. The light output is excellent and I expect the light will last about an hour or so. Try not to turn the head of this flashlight too tight when you turn on the flashlight, else you maybe unscrewing the flashlight head (the reflector will drop out) when you try to turn off the flashlight. Alternately, you may switch on and off the flashlight using its removeable tail cap, to avoid the reflector falling out issue. When using the extension tube (2xAA) with this flashlight, except 70% performance of the CR123A."