like geojap, i am also not on a swat team. but i don't think you need to be, to get some benefit from a couple lightweight add-ons. on friday nights at a local indoor range, we do close-quarters drills with the lights both on and off. for that, i keep a surefire mounted to the rifle, so i actually have developed an instinctive use of the light along with live fire. and since power blackouts are a prime time for looters and burglars to go out and play, i feel really good about having it on my rifle.
so i have to back windwalker on this one. if i ever do actually need to pull it on someone who has broken into my home, i like the idea of the disorientation from a 120 lumens bulb in his face, as he hears the sound of a 77gr hollowpoint slamming into the chamber. i would much rather have to end an encounter of that nature by mopping up urine, than blood.
as for lasers, i wouldn't trust any of the civilian-market models as a 100% reliable point of impact tool. and i certainly don't plan to spend the same price as my rifle for the real deal. but, that said, i believe that anyone who is doing Bad Things will have a very profound 'what the hell am i doing?' moment when they notice a laser dancing back and forth between their eyes.
sorry if i tend to get a little wordy, when a topic really strikes a nerve.