I have been in the red dot on pistols from June 2001, which I think puts me among the very first to do this.
Back then it was a Dr. Optics mounted on a mount that fit in the dove tail for the rear sight is. As an aside my son still uses this Dr. Optic and it is going strong.
Then I got a Trijicon which I think is pre RMR, I just found it in storage and replaced the battery after it sitting there for 7 years. Surprise it still works and is going to sit on a Ruger .22 bull barreled pistol in the near future.
Then I have a few RMR;s both auto adjust and manual adjust.
I now have added a Holosun 509T, I love this sight and the dot in the circle. What I don’t love is it sits higher than the suppressor sights I have on the gun. But if I grab the pistol in a sloppy way the big circle has pretty much always been in the window and guides me in. So I am not over concerned about like of backup irons.
This brings me to my favorite red dot sight of all, Leupold Delta Micro. When I first put it on the pistol, I had a black front sight on the gun, and it was not the best. I have since replaced it with an Americglo standard height front night sight.
This is fantastic!
It really sped up acquiring the red dot.
Many that have not used this sight maybe concerned by the small size of it.
Don’t be, when you do target focused the red dot just hovers in space in front of you. The tube basically disappears in your vision.
Lastly I will address the way it looks, it is different.
The battery hanging off the back of the slide has never really been an issue no matter how I carry it.
I have it mounted on my Glock 34 with a 6" barrel, so it is a slightly longer pistol and the battery off the back of the slide makes it even longer, but again no problem.
I have carried it a variety of ways, IWB at the about 1 oclock, I refuse to do appendix. Then I have tried it, just to the left of my center line in a cross draw and had zero issues. Lastly in a vertical shoulder holster than I developed, total comfort and concealment. The only holster it really has issues with is horizontal shoulder holster. The problem is the long barrel makes it poke my jacket out and prints like crazy.
So to wrap it up, I have totally converted in my mind to closed emitter dot sights. I will never go back to open emitter sights.
I wish that Leupold would make this sight with a green dot also.