Very reliable and durable. The diameter light distance is clearly seen from 180 ft away and lids the area very well. I just wish the flashlight had the button the top rather at the end of it. It's very akward to push the button and sometimes is troublesome to keep it on. I prefer to turn the knob all the way to leave the flashlight on constantly rather than keep pushing the button to keep on for a few seconds. Battery life is good so far, but i will update this on a later time.