I currently have 7 of them. 1 ZA-3, 4 are ZA-5 and 2 are ZA-5 HD's. I have sent one back (a ZA-5) for focus issues. It was replaced and back to me in less than a month, with shipping both ways.
The ZA-5 HD's are MUCH better than the others in regard to clarity, color rendition and tracking. I have taken one of the HD's out to 1123 yards, dialing it up to max elevation (still had to hold over the target) then back to my marked zero with no problems.
The ZA-3 is their price-point scope. Behaves as you would expect for a mid-to-upper $100's scope. Accuracy is good but not anywhere near the clarity and sharpness that you find on the HD's.
I haven't had a Meopta as of now, so I can't compare them to that. I haven't had a Leupold in 20 years. I do have 2 of the Zeiss Conquest HD's and find they are just a little sharper than the Minox HD's.
I'd buy another Minox (on sale) over the Conquest HD's simply for the $$$. If they were both at 'regular' price, I'd go with the Conquest.
Pay it forward - Kids are the future.
Stupidity is the deliberate cultivation of ignorance