I've been using an 8MOA since last November, and I have a couple of notes.
I had it mounted using a CZC dovetail mount modified for a Kadet2 22lr slide for a long time. Dot was great, fast to find outdoors, but I can understand the complaints about a large dot on abnormally small targets. If you shoot at a 1" or 2" dot at 25 yards, you are going to have a bad time. Most of the users of this sight are shooting at action pistol targets, as am I, so this is a non-problem for it's intended use.
I had an astigmatism before I had LASIK and most of the rifle red dots I use appear as "/"'s to me. The 8MOA dot is abnormally clear to me, really clear crisp edge. This makes no real difference in it's intended use for fast action shooting, but it's great to stare at when you take your time.
The brightness is great, however I would prefer if there was a dimmer setting available for indoor use. On the plus side, the dimmest setting is nicely visible, if a bit 'transparent' outdoors, so it's nice that even if the brightness somehow got turned down all the way accidentally, you'd probably be ok for the stage unless you were shooting directly into the sun or something. I cannot make the dot 'transparent' indoors in my experience, and I wish there was an option to do so to make indoor sighting in easier. This is not a 'problem', only a 'preference'. I can see the value in making the dimmest setting still usable outdoors, just understand there's a corresponding drawback if you shoot indoors. The dimmest setting is not distractingly bright indoors for normal use.
I have just moved the sight to a CZC milled slide with a custom mounting plate from CZC for the alpha 3. Unfortunately the milled plate system does not have the front 'pins' available to lock the red dot in, as such it's relying solely on the mounting screws to keep the sight both pulled down AND pointed in the correct direction. This doesn't appear to be 'enough' as I sighted in the optic, gave it a light tap on a wooden table, and the POI shifted a few inches to the side, tapped it back on the other side and it went back to POA. I've since reached out to CZC to see if there is a recommendation I'm missing regarding torque specs, or applying something between the sight and the plate to 'bed' the sight. This is nothing against the sight itself, just sharing my experience, which I'll update as CZC works through the issue with me if possible. Worse case scenario I'll just bed the sight to the plate in some manner, but it's not as refined of a mounting solution as the universal dovetail mount for some reason.
