I just received one the other day and had to send it back for store credit, as the lens was loose and the etched reticle would tilt to the left when moved.
I just won it in the latest members raffle here and after looking at the illuminated image with that upside down horseshoe, I really didn't like it, so when I shipped it back to Primary Arms, I asked for store credit so I could buy a Burris Fastfire 3 instead.
Also, the rear lens cover would fall off when you lifted the cover up. The front one had a really tight grip and even when I swapped them front to back, it still fell off the rear. I think the diameter must have been slightly smaller. That bugged me a bunch.
On the return slip questionnaire, there was a dedicated selection box asking if the lens was loose. Seems that might be a problem with these.