Extremely bad parallax - Meprolight Mepro RDS Electro-Optical Red-Dot Sights

Parallax is terrible and frankly unacceptable for use in a red dot. If you buy one of these things, set it down on a table and test the parallax. Put the dot on a reference point, and move your head back and forth and see if the dot is still on the target. Even a small amount of movement induces a noticeable parallax shift. The horizontal parallax shift near the edges of the viewing window gets so bad that it it is off by several feet at 100 yards. The worst part is that the parallax starts almost immediately - there is a very, very small safe area near the center where you don't see parallax shift.
This is a red dot that requires you to shoot nose-to-charging-handle and would be very difficult to use in any sort of unorthodox or compromised position with a bad head angle. The large window is pointless given how bad the parallax shift is.
Absolutely no reason to ever buy one of these nowadays. I have vintage Aimpoints from 25 years ago that exhibit less parallax shift.