It can be difficult to find the dot.
This is one I wondered about, until I started getting higher round counts on my 365X.
The presentation for the Romeo Zero (on mine at least) is exactly the same as for irons. So, once the firearm comes to presentation, the POA is already right there. The RZ is shake awake, so, there's no thinking about it, it comes out of the holster and up to the eye and is there.
And, there's no delay in finding front and rear sights--to me, at least--as the dot Is Right There.
If I take the time to look at the sight alignment, the irons are right there, and everything checks out.
Now, that's
my experience with the Romeo Zero; other will differ.
And, I will concur with many above about the "tube" RDS that are high above bore axis. And, anything that wants switching on. I'm not that sold on pressure switches for things, either, as it's one more thing that wants volition and deliberate action, which are durst hard to come by in a high pressure situation.
Now, this is my subjective reality (which makes it objective from my point of view). It very well may not be the solution for others, and I demur to suggest that it is. I only offer my observations for the consideration by others, not as prescription.