I'm a hold out on irons still, even being an old guy. I'm sure it has it's place but.....
3 years ago I attended a shooting event and met a friend there who had a Sig I think, with some kind of red dot. He had been home doing some repair work before getting to the range.
He handed me the pistol to check it out, I couldn't find the dot. Looked hard, wiggled it around for awhile but to no avail.
Gave it back and he started looking for it. After about 10 seconds plus he did, the reason it took awhile was he had been sanding drywall and the dust covered the lens (static) to where the dot was almost invisible. So, between my looking for it and his, we could have been in worse than a tight spot if it was needed at that moment.
So, I'll stick to my guns, with sights. I can see putting some hi visibility front sights on a couple that don't have them, or go tridium. But as far as a dot for carry, for my current purposes, no thank you.