Shot an action steel match yesterday where most of our squad was using an RDS (Trijicon SROs all around, I think, as they apparently all train at the same BJJ school). Didn't really pay much attention to the details of the pistols they were mounted on, but their ability to get hits compared to the iron-sighted shooters was interesting. Not sure I care about that necessarily for games, and not sure I trust any RDS for carry (nor am I interested in making my carry gun bigger, heavier and more expensive!) but it was interesting nonetheless.
What I think I arrived at while mulling it over on the drive home is to start by shooting the Glock I have, purchase a 34 MOS if I think that will make a difference with my G19 when shooting irons, use that as a test-bed for CCO at some point in the future, and then settle on something like the G45 as a dedicated CCO pistol and return the 34 to non-RDS condition when I want to shoot irons only.
That'll all probably take at least a year, at which point the G45 probably won't still be the answer.