Holds zero and is a pretty good optic - Sightmark Ultra Shot M-Spec 1x 24 mm Reflex Sight, 65 MOA Red Circle Dot Reticle

Has a red circle with dot in the middle. Unlike others this can't be changed, only the intensity can be adjusted. Mostly I bought it because of how bright it can be! It won't get washed out in the sun during a match; its very bright. Holds zero and performs well.
The bad: Can't be adjusted to just a dot, or at least I can't get it to do this. Also others have the ability to go from red to green, this one does not. I found that shooting at paper targets with an orange center can be challenging. I would buy this again.
I bought it for $179 + free shipping.