My 2 G-sync Acer monitors have been fine. The 4k has a bit of uniformity inconsistency but it's not noticeable when gaming. Other than that I have zero complaints. Well except for the cheesy blue power button. It's something I would expect to see on a $99 Walmart special, not an $800 monitor.
My PG278Q that has a manufactured date in October has been running flawlessly since being purchased in November last year. The display exhibited a bright spot where the G-sync module was mounted when new, but uniformity became very good after about a month of use. No power, connectivity, image, or backlight issues to speak of after 10 months of heavy use.
i purchased a pg278q about two months ago and it still running the same way out of the box... sometimes i wish it was the panel was ips... the thin bezel was a huge plus....single input....1ms GTG.... it made me wish i didn't already own catleaps otherwise i would have purchased two more
it supports ULMB but only when Gsync is disabled....and the monitor can only be rotated in one direction...
Most of the people complaining have early adopter syndrome. The first few batches are bound to have issues, I own 4 G-Sync monitors (3 of them to be sold) and not a single one has a dead pixel or issues. They key is I waited 3-4 months after they came out to buy one, and when I bought one... I bought it from a place i can physically return it if i had to (Microcenter).