Random thoughts and tidbits from someone who has been shooting exclusively with an RDS on pistols 2015:

Deltapoint Pro with the triangle may seem great in theory; zero with the tip and use that for precision, and just use the entire triangle when going fast. However, very few people actually seem to like that concept once they try shooting with it.

You can make a smaller dot appear bigger by cranking up the brightness, causing bloom.

Larger dot sizes seem to work better with auto-adjustments, as they are more forgiving of lighting conditions, particularly with WMLs.

Getting faster with first-round-shots with an RDS is simple: practice your draw and get a good index, which can be done dry. Just remember, simple does not mean easy. Once you get the draw down, now you have to work on SHO/WHO index, or positional stuff. You can use the irons as a crutch to get alignment at first, but you will eventually need to let go of that habit, as it will slow you down.

Learn to accept the wobble of the dot; there is no need for a perfect sight picture for most targets. Obviously, this goes into the same as the reading of your sights, as you would with irons, but many people are freaked out by the wobble and end up either being way too slow as they try to confirm a perfect sight picture or else they mash the trigger upon the dot hitting the part of the target they're aiming for, usually with poor results as they're unable to keep the gun still while doing so (there is nothing inherently wrong with the mashing the trigger, since there are very high level competition shooters that do it... they can just do it without disturbing the sights).

RDS-specific pistol classes are dumb. The fundamentals remain the same; would you sign up for an RDS-specific rifle class? To be sure, there are tricks and nuances to shooting an RDS handgun, but those can probably be covered in less than a half-hour, rather than being a 2 day class. I have spoken to Steve Fisher about this, one of the first people to offer RDS-specific classes, and he agrees, but continues to put on these classes simply because there is demand and he needs to fill classes.

I use my RDSes in manual mode always, in order to prevent washout with my WMLs (SureFire X400UHs). This does present some blooming issues when shooting at further distances at night, but it is what it is; I can still easily use it to hit the black on a B-8 at 25 if I needed to under speed, I just won't be confident of punching the X-ring like I would be during the day.

If need be, you can just use the sight picture through the optic as a crude ghost ring, whether that be for speed or because your RDS went down.