Are you talking about a red dot scope, or a laser that projects a dot onto the target? There is a difference. Red dots work pretty well, day or night. Some lasers will work in day light, but they will be hard to see at any distance. Not to mention lasers are not legal to hunt with in most states. Red dots are.

I have used both on shotguns, pistols rifles and bow. My opinion is that they work well for what they were designed for, shooting people in the dark. Other than that I would rather have a good scope or well defined open sights.

Paul