The Red Dot projection sight is somewhat of a monstrosity sitting on top of the weapon and while it does work well in the IPSC competition for unlimited race guns, it is not very practicable when carry, concealment, and holster selection is concerned. The same is applicable to the rail mounted laser/light systems for the most part.
Depending on which firearm you have either the LaserMax Guiderod laser sight or the Crimson Trace Laser is a great choice as the bullet goes where the dot is. I use it only in situations where rapid aquisition of the front sight is difficult. Shooting with the laser is almost cheating as the round goes where the dot is, period.
You get used to looking over your sights and looking at the red dot very easily. You have the added factor of intimidation with a perp when working narcotics and needing to diffuse the situation. They have seen enough to know that when they see the little red dot on their chest, a bullet can follow. You have to make them aware of the dot by sweeping their face as most don't look at their chest or forehead easily. LOL. I am constrained by concealment requirements while a reserve deputy and CCW. The red dot may work for a competition/range gun, but not for me.
Hope this helps. Shoot well and often and stay safe.