Very interesting thread. One thing that I am taking away from this is that "It's the mileage, not the age" applies to these RDS's life span. These optics are judged by round counts until failure.
My only experience with a RDS on a pistol is on borrowed rimfire .22s which don't have the same recoil as a center fire pistols. I liked it. I liked it enough to consider using one on a center fire pistol. However my yearly round count outside of class time is nothing even close to the majority of shooters here. A case per year outside of classes in a good year, often less.
As I approach middle age my eyes are starting to do weird things. New glasses help, but the RDS equipped pistols helped too. I'm just trying to justify the "cost per round" for a RDS and slide. I'm debating of it is worth spending the cash for a pistol that I shoot relatively little.
I really don't have anything to contribute, but just wanted to mention that I'm enjoying the thread and discussion.