Display Enlightment by NCX

Hey there ncx, i was wondering why you recommend the Lenovo Y27g in your Best 24-27" 144hz 1080p G-Sync Monitors ? From all the reviews i'v read, and videos i'v seen a lot of people seem to be having problems with gsync on this monitor causing flickering and overdrive function being unusable.I'm asking because i could get one for a really good price, and that's why the dilemma.