I've owned a few of these ACOG clones from Ohhunt and they seem to be some of, if not the best, knockoffs. Glass quality is fine, fiber optic and illumination is bright and crisp, clicks are 1/2 MOA I think and holds zero. I like the diopter adjustable ocular lens but there's nothing to hold it in place once you adjust it for your eye. A wide rubber band or piece of innertube should fix that. I wish it came with a QD mount, but for the price I'm not complaining. Only gripe is the eye box is super tight but the real deal has that problem too. That's just the nature of this type of optic.
TL:DR If you want a cheap 5X you won't be disappointed in this. Just don't forget to Adjust the ocular diopter, It's not at 0 out of the box.