I have a first GEN L-3 MPO (557) 4X-Magnifier. (Which is by mil name SU-213/PEQ)
Never experienced a problem with it. It is for the most part what it is. A combat weapons sight that does exceptionally well at CQB. Also, has been and remains accurate enough to ping 10" steel out to 300M having been on and off the gun (RTZ). Battery life is okay, I never trust my life to a questionable battery.
I'm happy with mine, but I don't go shooting anywhere near the extremes listed in the SOUM. Zero has not been "knocked out" and the "Parallax" issue isn't an issue.
Now if I could ever afford that AN-PVS/14 I'd know if the NVG system worked.
I read that whole thing even all the comments. There will be haters and those that don't. I don't care if the mechanical adjustments are "close" it's not a precision optic. I'm not overly worried that it "might be" at worst, two-inches off POA at 50-yds above or below 122*f -40*f, I don't work in those environments.
Are there better? Yes and no. All have some trade off. Knowing this info is good but not enough to trade in. I have illuminated precision scopes, AIMPOINTS, Red-Dot HWS "Quick Sights" and traditional high quality precision reticle cross-hair scopes. They are all better than I am now and probably then too. It fits a "niche" and does it well.