I am using the same panel. Works fine by me, it is TN but a good TN panel. It cannot beat the best 4K panels running IGZO tech like the PQ321Q from Asus or the Dell Ultrasharps but I'd sacrifice color accuracy over G-Sync anytime. Frame drops to 30-40fps on 4K max settings is common and in that sense, G-Sync helps more than color accuracy. You can recalibrate the colors later to your likings anyway.

Although I'm using the Acer 4K as temporary measure until Asus finally get off their lazy ass and releases their ROG PG321AQ 4K IPS monitor. It's been announced more than 5 months ago and still not available for release, only seen at tech shows like Computex, etc.

Asus build quality better.

Benq build quality trumps asus. Price too.

Here is the thing theres too many connectivity advancement n panel tech etc.

Normally we buy monitors n they last a good over 5 year
4k gaming is a reality now but not for refresh rate. Gsync works best with a large refresh rate window.

Go into 4k when dp1.3, ips 120/144hz becomes a reality. reponse rate is another issue

Early adopters of swift .. It was the 144hz gaming that was 120hz gaminh that was awesome.

Rumour has it nvidia has a newer iteration of gsync.

So decide. We buy gpus on game now concept. Choosing monitors atm not a easy thing to decide.

From all the reviews I read and watched, 980Ti can get minimum 35fps and upwards on 4K at max settings (or max settings tweaked with some options turned off). That is enough to run 4K with G-Sync compensating for the 30+ fps framerate. Some games are finicky when it comes to enabling SLI and I had to run them as a single card Titan X, and I do get framerates like those (4K at 35fps and above). My Acer 4K G-Sync monitor compensates beautifully for it, resulting in a smooth gaming experience, even at that fps. I would NEVER game at those fps if I am gaming on a non G-Sync panel, the stutter and frame drops will be too obvious.

The experience is definitely better at 1440p, but I dunno about you, but for me, once you go 4K, turning back to lower res seems awful looking to me. Besides, 1440p on 980Ti at max settings, you can probably get away without using a G-Sync monitor since your framerates will be high enough to notice any frame drops.

Acer 4K 60hz G-Sync if you need it now, Asus PG278AQ 4K 60Hz IPS G-Sync if you can wait for it to release.

Put it this way: if it was me, and I've never seen 4K before, an UltraWide would be okay. If I've seen 4K, it'll be hard on me to go back to anything of lower resolution. Even if they're 144Hz. It's no small feat to get a game to run at 144 frames per second, and it may require you to drop game settings from Ultra or Very High to lower, and personally I dont game any lower than those two settings. Personal preference of course.

Also personal preference, if you had to go immersive gaming, that Ultrawide is better than putting three monitors together for Surround. Personally to me, bezels on monitors takes away immersion.

Most important of all, whichever monitor you choose, get G-sync.