A laser that can't be flashed or turned off in a deadly threat event will give the agressor your position just as it lights him/her up. The best ones are those you can flash or easily have on then off. Many trainers have had concern with the grip lasers as they are on if you are holding the weapon ready to fire, or off completely. Nothing is a substitute for muscle memory, training to point shoot (no sights needed), and training with stress causing scenarios. Do not underestimate the body's reaction to stress, target shooting is a different game as compared to saving your life!