I have a Bushnell Trophy RED DOT on a CVA Staghorn Magnum. The DOT does have some advantages and some disadvantages.
In low light or at late after noon at close range, the red dot is a real advantage. I've unloaded my rifle at dusk/night, walking out of the woods and it hits at 25 yards right where you put that dot. During day light, it shoots some very impressive groups.
Disadvantage are, at longer ranges like 100 yards, you can got some 5" groups easy, but I've also shot some much better then that. My dot is a 3MOA but that is 3" in what ever part of the previous circle you place it. Also as the light fades outside, the dot can grow a tail. You have to learn to ignore the tail on the dot. The final thing I mention is, because of the size of the tube, long distances in low light actually seem darker through the tube then with the naked eye.
I rate a RED DOT as an excellent 50 yard and under sighting device. Even in low light. Once the light fades, you need to pay a lot more attention to what you can actually see before you pull the trigger.