One thing about red dots on handguns-
They all pretty much are higher above the bore axis than the iron sights are.
Yes, they are used on open division pistols in IPSC/USPSA and some other gun game sports. However, if you have never shot those games, it is somewhat interesting watching someone who is new to them trying to use a red dot gun. They sometimes find the dot and are using it great, and sometimes they stand there for 5-10 seconds looking for the dot.
Part of the reason the cmores are popular is they are one of the few red dots that are bright enough that they don't wash out in bright sunlight. The old optimas were notorious for that.
It takes lots of time to develop the muscle memory and be in the right position with them so that they are as fast as a set of irons.
The closer to bore axis the dot is, the easier it is for someone who is used to iron handgun sights to use it. That is the real reason for all the cut outs on the slides on guns with the dot sights. With long guns, you set the sight up so that it is in the right spot for the cheek weld to put your eye at the proper line up spot- makes them easy to use that way, and the whole sight height issue is moot there. Pistols, you have no physical reference, and any inconsistency in your firing stance will make the sight effectively useless to you.
Personally, I think rails are ugly, but if they work for you they are good then. I also think interchangeability with your optics is a bit silly- you are going to have to resight it each time you put it on a different gun (and you really ought to recheck your zero when you reattach a "return to zero" type mount as well even if it is zeroed to the gun. I have seen them do some pretty strange things occasionally) and most red dots are a bit tricky to zero.
The nice thing about the RDS are that you can concentrate on the target rather than on the front sight- optical planes and all that. They do promote situational awareness and can make shooting multiple targets in a string much faster. The down side is unless you are using a very small dot, precision can be iffy. (and the small dot costs you the speed advantage that the RDS gives you.)
Red dots can really allow someone whose eyesight has degenerated the ability to shoot handguns accurately again. They also require much more maintenance than a set of iron sights do. If you are putting it on a defensive weapon of any sort, you had better be willing to do the maintenance, put in the familiarization time and recheck the zero periodically, otherwise, you can really have your rear hanging out there.
As an example, I put away one of my open guns (with a cmore) for the winter a few years back, and a match came up before I had the time to go and check the zero the following spring. A gun that had been dead on all the sudden was shooting 4" to the left at 15 yards. Not huge, but caused some issues- but that was an IPSC match not a real life situation....