This is at the time of writing, easily the best value for 4K monitors. Sure there are a couple of 28" TN panel 4k monitors but you wouldn't really want those simply because of the weakness inherent to TN technology, and they're 28".
For a lot of people, they go for larger 4k monitors because they're afraid of this scaling issue with Windows, and the issue is very real. The way I see it is that 28" is not nearly big enough to avoid this, you'll still have to use the scaling anyway. I feel like I have enough desktop real estate atm so I am perfectly fine with a 200% scale on a 4k display for effectively a buffed up 1080p display.
And that's really the story here, is this the best value for ANY display? even at this price range? I don't think so, there is the scaling issue, especially if you're like me who also has an older traditional low density display, using them together is going to be impossible unless you have Windows 8.1 and above. So keep that in mind. Even with 8.1 you still have problems for example text on your traditional display is gonna look even worse than before, yes! And this is purely because ClearType sub pixel smoothing doesn't work anymore, fortunately this doesn't affect any kind of graphics content. Desktop icons don't change scale from one display to another so they'll be huge on one and tiny on another. Some applications will not change scale from one to the other either, like the Task Manager, yes...
However, the most commonly used applications like the web browser, does work perfectly, just like Macbook Pros with Retina display. You can browse web pages and they'll think that you're using a 1080p display so things don't look tiny, but they're super sharp and fine. Photographs and the handful of 4K videos do look very good even though it won't blow you off your chair. It's more subtle, sometimes you start to think (if the content is well-made) that you're looking through a window at real stuff instead of pictures on a display. Where as photos on a good traditional display can seem sharp, you don't really get that feeling, as if you know it's not very sharp subconsciously.
Performance of this hardware however, is just one word for me, perfect. I mean yea it doesn't do Adobe RGB but it's not like I have any Adobe RGB content anyway, that's not the point. The point of a premium consumer product like this one, is just to deliver content as accurately as possible, and it absolutely does. Calibration is superb, colours are accurate, uniformity is perfect. There is some minor bleed but it's totally dwarfed by IPS glow and just normal glare from the rest of the room, not even windows. It just delivers everything an average consumer would reasonably need from a monitor.
As for gaming, yea you know what there is some improvement just from the sharpness. But unless you exclusively play games your graphics card can handle, which means light duty games or super duty graphics cards. You could be doing more harm than benefit here. I run a single HD7970 and I can play Lol just fine, everything looks perfect and that's great, but the experience overall isn't really massively improved, especially compared to something like an ultra-wide or even curved display. So if all you're gonna do is AAA gaming and you don't already have at least dual top tier graphics cards, this would not be a wise choice.
Watching videos, things pretty much look the same as any other well-calibrated display. The contrast is a bit better, but since there really aren't any 4K movies, you can't take advantage of the extra pixels at this point in time. Yes even things like single strands of hair in 1080p movies look pretty much the same as on a 1080p monitor. Mostly because things are constantly moving, even just slightly, and any pixelation becomes extremely hard to see. I haven't tried to sharpen things yet, it'll probably be massively CPU intensive and just not worth the hassle, so again, obviously it's perfect for watching 1080p movies, but it's an overkill to do just that.
In conclusion, if you're a Mac user, this will likely be more worthwhile just because you don't have to deal with all the stupid scaling issues on Windows, and yes some of these issues can be crippling, for example Adobe's CS6 and previous softwares don't scale at all, and trust me unscaled Photoshop has extremely small controls on this monitor. Some applications simply won't work at all because a critical button disappeared or something like that. Even though the most basic, most commonly used things will be totally fine and usable at least, with pixelation at times.
If you're a Windows user like me, I recommend more caution. Do you read a lot of text? then absolutely. Do you just watch movies and game? Probably better off with a bigger ultra widescreen. Graphic design? totally, just make sure you have Adobe's CC softwares (Lightroom works perfectly).
There have been a lot of people complaining about connectivity issues with this product. I have not had any problems, I just connect and it ran at 4k 60z no tweaking what so ever. Honestly I think this has more to do with incompetent people using outdated hardware than bugs with the monitor itself. If you know what you're doing I really don't think you should worry about it.