Summary: I was leery about buying this from some of the negative reviews. The price seemed too good to be true (4K monitors as large as 32" are prohibitively expensive in April 2015). This monitor was everything I had hoped for. I can't see the individual pixels. I had no configuration problems of any kind in hooking this up to my computer, except that for $1300+ they could have thrown in a $12 HDMI2 cable. All of the display images are proportional.
Summary: Wow! What a monitor. I have been using the Dell 30" 2560 x 1600 monitor, which is nice, but has some Power Down Mode issues. But this monitor does not have any of that. The upgrade to 4k was amazing! If you are even half thinking about it, just do it - you will not be disappointed. Amazing detail, and the color is fantastic. This ASUS monitor worked right out of the box. No problems (I have a Windows 7 OS).
Summary: It's gorgeous! It's like having a giant MacBook Pro retina screen in front of you. Since I spend as least 12 hours a day looking at code it's well worth the investment. Prices will likely drop but $1500 was the tipping point for me.
Summary: First, WOW. I'm a software engineer and I love screen real-estate and boy does this have it. Great looking monitor in every way. My only negative comment is that it takes some time to get the video adjusted. For example, out of the box the brightness is 100%. Had to tweak all the settings and it could have been more on the money out of the box. Other than that, its just stunning how large and clear it is.
Summary: The monitor was ok, I got motion sickness from just using the monitor for any games. This might not affect anyone else. The monitor interface looked a little outdated but functioned as needed. The audio on it is really weak so better look else where on that department. Personal opinion 4k widescreen vs 3k ultrawide I choose the ultrwide monitor. It brings more benefits to the table vs getting a 4k widescreen.