I shoot a bit with red dots on my pistols. I've run Cmores, Fastfires, DeltaPoints, RMR, SROs, on and on and on...
The best ones I've been able to put my hands on for the competitions I do are the Sig Romeo Max and the Romeo XL. They are phenomenal, even with my astigmatism. They are almost as crisp as the Cmore slide ride dot but since the housing is so much smaller it sits much closer to the bore axis.
No doubt in my mind that it is sped my up a bit with my pistol shooting. I'm not much of a fan of the small plastic Romeos that are designed for carry guns. I am all about those Max and XL models though. Only downside is they are very expensive.