Been a while since people have replied and there certainly has been some evolution in reflex sights (red dots). There are just a couple of things to point out. I do not see a real downside to having a red dot if you a have good set of co-witness sights. I select a very visible front sight, white dot, fiber optic, or Tritium with luminescent ring. Why, because you still have highly visible irons. Having the good co-witness sight can help getting the dot on screen but also if there no dot because of incorrect intensity, you have your sights. Seems the best of both worlds. Keen eyesight and good irons really does work well but if you eyesight is somewhat degraded, red dots really help. I think the red dot intensity setting is one of the challenging things about red dots. Auto settings on ambient light do not work well when there is contrasting light between downrange and shooter position. I use manual intensity and use red dots with easily accessible brightness adjustments. Close range is one thing but Ithink about a situation where you may encounter a mass shooter who is not that close. I want accuracy for that. Odds are extremely low that you will encounter this but it has happened. We absolutely do not want to hit the wrong person. Reflex sights like the Holosun ESP Carry are really game changers for smaller carry pistols.