I just picked up that ASUS VG248QE monitor last night, for BF4 it was amazing compared to an older LCD HDTV I was using. The only issue ive had with it is that it does need to be calibrated a bit to look decent although I guess if you lower the refresh rate the color improves. I will be more then happy to post my settings if I get a chance tonight after work to tweak it a bit more.
This is what I posted in a thread I started yesterday after using it.
"So I ended up buying the Asus VG248QE since it was much cheaper then the ROG Swift ($400 difference) and the store was closer. The difference between the Asus and my Samsung LCD HDTV is massive, input lag and response times were drastically reduced plus the smoothness of the 144hz during BF4 made a huge difference as I reduced the quality to Med (AA low/Mesh ULTRA) so that my frames stayed between 160-199 with only a very few drops (unnoticeable during game play, saw only on CAM Software). Because of this my scores improved a lot as before I would get maybe 1-2 kills per 1 death now I'm getting 4-5 kills per 1 death (in the 3 matches I played). I guess my only complaint with the Asus is that it needs to be highly calibrated out of the box since stock settings are atrocious. I would highly recommend this monitor if your playing and FPS/Racing games."
http://www.tomshardware.com/forum/id-2977789/monitor-build.html
I was trying to decide between this Asus and the Asus ROG Swift.