The addition of a small red dot sight (RDS) on a compact pistol is not very challenging. I sometimes wear my V1 9mm Shield with the Shield RMS (Ruggedized Miniature Sight) red dot mounted in a custom milled slot.
I already had an extended Kydex AIWB holster. I cut a little away to allow for the sight. No problem.
All shooting is faster and more accurate for me. Inside five yards whatever appears in the target window, even without noticing the dot or iron sights, is where the bullet will hit. It is point shooting with an easy guide.
When I need precision, the dot allows me to focus on the threat, not the out-of-focus iron sights. Where the dot is the bullet will be. There is greater room for sighting latitude since the dot can be anywhere in the window and where the dot is on the target is where the bullet will hit.
Aligning iron sights on the target requires three planes of focus switching quickly, something my eyes are challenged to do. If it is a real threat, the back sight will disappear, and both the target and the front sight will alternately be fuzzy. Human eyesight programming more naturally focuses on the threat. Red dot wins.
I change batteries before they die, at least every six months. It’s cheap and easy. The RMS has an automatic brightness adjuster that works well. The dot changes slightly in size as it gets brighter, but it stays under 4moa.
I recommend it to those who can afford to do it properly, and who will practice grip, presentation and trigger pull sufficiently with the new system in dry fire. This learning curve is short for some—a few hours over a few days—because they are already used to aligning iron sights with a good grip and presentation. Just continue what you’ve been doing but see the dot, realizing you are now focusing on the target rather than the sights.
Iron sights have been around for 150 years. Sure, they have been refined, although some of the refinements are actually confusing to the eye and brain. Nothing is better for sighting than simply overlaying a dot on an in-focus target. RDS are new, therefore there is natural resistance. They will be more and more common.
For most, the initial expense of something new is the deterrent. Trying someone else’s rig is a good idea if you can find one set up the right way and who can instruct competently. Usually start with an RDS on a full size gun. Scaling down is not hard and improves the shootability of the small gun.