I posted some of the below in another forum, and I've now had this monitor for a few days:
I have this monitor now (UK), here are my initial observations (in no particular order):
1. The screen is semi-gloss. It's definitely less matte than other screens, and the Benq 32" panel I've been using for the last few days. No hint of AG problems for sure.
2. Height from desk to the underside of the monitor is just under 3"
3. Blacks are inky, gaming @ 4k in Elite Dangerous is simply stunning.
4. The top of the monitor is too high for desktop work using the supplied stand. I plan to buy a desk stand and drop it to desk height - this will be perfect. (I've bought an Ergotron stand which I plan to try tonight).
5. Very surprised to find 1440p scaling works well (very limited testing so far) - but Arma III and Crysis 3 are very playable with no obvious issues. This has made me quite excited as I have best of both worlds, especially for games which aren't SLI friendly (I run SLI 970s).
6. Input lag. I can't measure this, but I can say that again, from my limited testing, this isn't severe. BF4 very playable, and so long as 60fps is constant there's no issue. Certainly, I think it's slightly less than the 32" VA panels which are out there (Acer/Benq/Samsung).
7. Motion blur. It's there, for sure, slightly more noticeable than on the Benq. On the Blur Busters scrolling text test, the "Alice in Wonderland" text in bold has very noticeable trails. The remaining text looks similar to other displays I've seen/used.
8. OSD. Terrible. I hate the little joystick on the back. Give me buttons for inputs and other settings rather than forcing you to remember which way to push the joystick each time. Ultimately it's not really a big deal as personally I don't go into the OSD often, but it's still annoying.
My testing hasn't been comprehensive so far and right now I'm pretty much wow'd by the panel. So the caveats: I'm no competitive gamer, and if you are then this isn't going to be for you full stop - stick to your ROG Swift. I can tell there is lag, especially in something like CS:Source, but for me it's not a deal breaker and this unqualified eye doesn't think it's bad enough to be a problem (for me).
9. The VA "cone" effect. Sitting in a completely dark room from 3' away, the corners are clearly uneven and if you didn't know better, you'd say it was a backlight issue. Moving your head so the corner is on-axis eliminates the problem, which means this is an issue with viewing angles (VA cone effect?). It's not that things become difficult to read or see, but the blacks turn to a slight grey.
Let me say now that under normal conditions the blacks look inky black, and the issue isn't like the horrendous 34" superwide problems out there. But it's definitely noticeable in a dark room with a backlight bleed test running.
For me? Well I've been through a host of monitors, Dell U2713HM, U2412M, Qnix 2710, BenQ 3200PLT, various TN ones and none of them hold a candle to this. It's not perfect, but it's the closest I've seen for a multi-purpose monitor. 4k, 40" and under £700 to boot? I'm happy so far....
PS If connecting via displayport this runs 1.1 by default - so make sure you change it in the menus to achieve 60hz (yes, it took me a few minutes to work out during which time I thought "omg this is awful" just from moving a mouse around the screen! )