This subject comes up frequently in all the gun related forums I am on. Some responses are negative, many are down right derogatory. Very few are positive. I am neutral to slightly positive. A LEO acquaintence of mine suggested that the only time he thought it might be of benefit is to have it in your hand when LE arrives after a SD shooting where you are holding a gun. A momentary hesitation on their part so sort things out so you don't get shot is a good thing. Otherwise it should remain as concealed as your carry weapon.