I have an old Tasco red dot in a .22 PCP pistol. It (3moa dot) is fine for shooting targets out to 30 yards. I had it mounted on my 10/22 Ruger and didn't like it, preferring a scope.
I bought another lower priced red dot newer and shorter for another PCP pistol, tried it once, took it off and it sits in a box somewhere.
I thought I'd try a 2 MOA red dot sight, but just never got around to it.
I have to wear my glasses due to my astigmatism, or I just see a slanted line of red in them.