Wish I could be more help with details on some of your, very good, questions. I put a Leupold DeltaPoint on a Gen-4 Glock 21. I did it pretty much for the same reason you are considering it ... "will I like it?"

The RDS I'm using does not adjust for daylight or dark, so works reasonably well with a light, the dot does not wash out when set to a medium brightness.

I have mixed emotions on the pairing.

The one advantage that I see is that it seems to work very well with gross motor skills for fast acquisition of center-mass shots "from the leather". Accuracy on small targets (third shirt button down) using fine motor skills is taking a lot of practice for me. I like the "two eyes open / look at the target, not the dot" method, as it helps me stay on target. I have, occasionally, won the dueling tree with it; but not as often as with an iron-sighted 1911. Not to disparage the RDS Glock, just more rounds down range with the older platform.

I guess, would I do it again? Yes. Would I carry it? No, not without a lot more practice.

Will be following to see the advice from some of the regular users/professionals that carry a setup daily.