I have a lazer max on my g21 and by the time i shoot my second round it shuts off.?????? spent almost 300.00 if i had it to do all over again i would have bought night sights and a tactical (hand held ) light. don't care for lights on guns, if it's the only light near you when the wolves are breaking down your door and you are getting all your family in a safe spot you might be pointing a loaded gun at them so you can see them in the dark..but to each his or her own.
I like the different color front/rear sight combos. I think it helps one focus on the front sight. My Ameriglos are Green front/yellow rear. The green is also brighter than the yellow so it really helps me focus.