It does seem a bit complicated. I tried to give it a chance by telling myself, "Okay, it's a one time adjustment process." but as I watched the video there were too many moving parts and buttons to fiddle with. Even the presenter fumbled a bit when he took out the battery, put it back in, and forgot to hold down the two buttons to take it out of "lock-out mode".
I'm no firearms expert or LEO but I wouldn't buy that thing. Your standard flashlight seems adequate enough to get the job done.