Better to have it and not need it, than need it and not have it.
I shoot a CZ SP01 in PPC, while I like the irons, my eyes are not the best. I found RDS helped me improve my longer distance shots. I don't need to strain my eyes trying to focus on a sight, since I keep both eyes open. I just sent my Shadow out to be milled to basically be a CZ Shadow MOS. Since I wasn't a huge fan of the dovetail mounts, since it sat optics too high.
If I was to get another Glock, I would go with a MOS.
The only disadvantage at the start and it will improve over time. It is slower to acquire the dot speed shooting.