I've got the AOC G2460PQU monitor and have had it for about six months now. This model number doesn't support Freesync or GSync but it does run at 144hz flawlessly using a pair of nVidia GTX670s in SLi.
It didn't self set to 144hz when I installed the latest nVidia drivers, but it was an easy change in the nVidia control panel. These are decent monitors considering the price point and it's hard to go back to 60hz after playing BF4 at 144hz.
The main (and only gripe) I have about the PQU version is picture quality and color washout at 144hz. You can definitely tell when you switch to 144hz. You can gain some back by adjusting the monitor settings though.
These monitors have extremely high brightness levels so you'll want to pull that down a bit, but contrast remains excellent right up to about the 50% setting in the monitor control settings. Color accuracy is pretty good for a TN monitor if you're running at 60hz, but as I mentioned once you set it to 144hz all bets are off.
For a gaming monitor at a decent price point the AOC G2460 series are hard to beat.