Actually thats a bit deceiving. That link you posted was to Qnix with multiport. That version has A LOT higher input lag(because of the added scaler of the multiport model), than the normal version with just DL DVI-D input. No one ever recommends that version, because its bad and its not even overclockable(some say they got it to 85Hz).
I dont have OSD, but i have a working brightness control
Only the multiport models have that PWM dimming you are talking about.
The lack of scaler in the Single-input model actually makes its input lag really low. Measured to be 1-3ms
You cant use the single-input model, with consoles though. Lack of scaler does this.
They actually are Overclockable and 120hz is NOT false... Its just the multiport version -----> check that out http://www.overclock.net/t/1384767/official-the-qnix-x-star-1440p-monitor-club
Quotes from the link above:
Here is more about the shitty multiport Qnix: http://www.overclock.net/t/1384767/official-the-qnix-x-star-1440p-monitor-club/18800#post_22351276
I have tested them both for frame skips and they skip none...
Image attachment is not working for some reason.. but here is my screen that is capable of 96hz and 120Hz
http://prntscr.com/58ioj9
http://prntscr.com/58iqae
TL;DR: You are confusing 2 different models together