For those speaking on total darkness: I understand your point 100%. Light, night sights and/or laser make ALOT of sense. Our setup is such: The bedroom is very dark. The front of the house has a fair bit of ambient light from outside (street lamp) and a few well placed night lights. If someone is there, I'll see them without question, but if I'm in the bedroom doorway, taking cover, I have minimal light behind me to illuminate the standard sights. This makes it difficult, in my mind, to be on target should the need arise.
Sounds like there's no real disadvantage to NOT having them. Guess I'll be saving up my pennies.....now, which ones?!?!?!?!