For competitive shooting I use a red dot on my H S Victor and IZH35M, but I shoot my revolvers with iron sights as I don't use then in competition. I did put a red dot on a Mod 17 for a little bit, but didn't like the balance. I have not tried the newer smaller dot's like the Burris Fast Fire III or a J Point on a revolver yet and that may make a big difference. It is fact that the red dot does make hitting the target with "aging" eyes a lot easier. My eye's are 71 years old, and I would have given up competition probably 10 years ago without a red dot. I will say, since my cataract surgeries I do see the front sight much better than I had in years.
I've gotten much tighter groups after installing this red dot scope on my 617-6 but it makes the gun pretty top-heavy. I've kept the fixed sights if my eyes get better. Having cataract surgery soon. Right now, can't see so good.