I have a Sightmark Ultra shot QD Digital switch. It has about 2500 rounds under it. Not a hiccup. Battery life is medium, at about 500 hours. Uses 3 AG5 batteries, that are not quick to replace. I still like mine. I can hit 3 inch groups at 100 yards with mine. Futher than that, you need a magnifier.
Doin' what I can, with what I got.