The 3M Pro is a very reliable light. I've bought about a dozen or so for colleagues and they've all been rock-solid. Not one has failed so far in the field. I previously had a "tactical" flashlight from another manufacturer (that shall remain nameless, so that this thread will not to turn into a flamewar) and after its first drop on the floor, refused to light up. What a terrible flashlight that was. On the other hand, my Jetbeam has been repeatedly dropped on concrete floors, tossed around and it still lights up every time! :twothumbs