Oh I know about this one and hate it, old eyes yuck!, only 60 but I have had to scope all my rifles, and with handguns I really only shoot by "point" since I can't focus on both sights & target with bifocals. (I'm Actually pretty good at the "point shooting" but it sure isn't target quality or anything like what I shot 25 years ago in the IHMSA.)
Wifey gave up and she now has CT Laser Grips on her revolver, just got them this week... but now I'm wanting mine! Still we really want to test out this "new" sighting system before we spend that much again (like 200+)... they look great, are very easy to use, sighted in with ease... Now we'll see how will they take recoil & retain accuracy.
BTW, the iron sights are still there so a dead battery should not effect SD.
k