I've mounted a dual illumination on a G17 MOS. This requires the use of suppressor sights in that while the green triangle is nice (and allows for both precise and quick coarse aiming) it suffers from bright target/dim surrounding washout (which many of the follow ons do not). The suppressor sights allow for aiming in such a situation.
Trijicon is generally considered the 'gold standard' of tactical optics but each has its limitations.
One thing that caught me by surprise is the Holosun series--specifically the 507c series (which I've mounted on my VP-40). It's got an easy change battery (which doesn't require a re-zero) as well as solar backup and the auto-bright works very well (it's available in a Muti reticle version as well as the ACSS/Vulcan type reticle). These work very well and have gained a good reputation. Long battery life, auto on, etc. The nice thing about either reticle is that you can get a VERY easy to find reticle on these RMRs--superior to a simple small dot. I had some HUGE reservations about using anything Chinese or touching Chinese, but so far these have demonstrated reliability equal to or better than things like the Sig Romeo series or even the Trijicon (which had problems with its original version and blanking--subsequently fixed).
The main advantage of any RMR is that it places everything on one focal plane which allows target centered focus while also allowing rapid acquisition and follow shots. This becomes especially important as one ages and vision degrades (and it's important to DO your training with whatever glasses you might be wearing--as well as without as might be the case in a bump in the night situation--and be able to work the sight/gun combination with either. Notably, in the Miami-Dade shootout one of the agents had his glasses flung off his face in the car impact and to some extent was subsequently taken out of the fight because he had trouble seeing so this is something to consider also). The main disadvantages are it's usually electronic (the dual illumination is not) and thus might be subject to reliability problems, adds weight and bulk (in some cases this can affect gun reliability so making sure the gun functions with the added mass on slide is very important), and the dot can be hard to find. The latter is largely a matter of training but it's REALLY easy to 'lose the dot' until an RMR type presentation of the gun is mastered. Also, this can be a problem when the gun is used in a tactical situation and isn't presented conventionally (like in the middle of a fight--some would counter that sights are of limited use at all in some such situations however something like a Big Dot can continue to be useful in bad environmentals and dynamic situations). Using an RMR of any kind requires significant training in any case.
Astigmatism IMHO is overstated a bit in that while the dot can blossom or appear as a few dots, usually they are close enough together not to matter except at extreme ranges (like in a hunting situation).
Good luck !
I couldn't help myself 
