Got the monitor a couple of hours ago, set it up and played around with stuff for a bit. Here are my initial thoughts:
TLDR is that it is clearly going to be a love-hate thing for a long time to come with this display - the monitor itself is very nice - I mean with the whole 4K/UHD experience.
First thing I checked (that I was worried about) was backlight bleed/glow and any dead/stuck pixels, thankfully at the moment no issue with the pixels but there is the (expected?) minor bleed on the bottom left and right corners and some glow, I guess, across most of the screen. But this is only really noticeable with fully/mostly black images in a dark room. It's about the same as I had with my old TN monitor so I'm used to it.
Compared to my previous 24 inch TN panel at 1920x1200 this one gave me a satisfying "wow factor" as soon as I booted up into the OS selection screen (GRUB) and into Win10 and linux, both the combination of IPS LED screen and UHD resolution, the UI, text, images, (mostly) videos look crisp, clean and, well, delicious haha. Almost as good an experience as it was moving from non-HD 17 inch LCD to 24 inch full-HD nearly 9 years ago.
Side note, my previous monitor rated power consumption was 50 watts while this one is only 29 watts.
Couple of minor annoyances is the silver colour metallic looking border/band around the edges of the screen, I would have preferred a fully black border. Other annoyance is the stand curved base legs juts out a couple of inches in front of the monitor and are quite wide, so my desk is currently cramped with the mousepad in a tight spot. But you can call these nitpicks.
The stand is definitely an improved one (VESA mounted) than the probably earlier one (which looked flimsy screwed on to the lower base of the screen) you might see in some reviews which people complain about breaking/not very adjustable etc, like
@Jc36 mentioned. Again, as you already mentioned, there are some annoyances with UI elements like buttons, text sizing etc so some tweaking/custom settings are needed here and there.
The border/bezel is quite narrow but not too narrow, which is good for me, because I have a logitech webcam that sits on top and doesn't obstruct the display.
Sadly, it's looking like my Skylake CPU alone isn't capable enough to properly handle UHD resolution to push even 2D graphics like scrolling/moving/resizing/maximising/minimising application windows on either Win10 or linux.
Probably need to move to Kabylake/H270 mobo (or get an RX 460 GPU) with DisplayPort for full 4k@60hz display - I'm currently stuck at 24hz due to only having an HDMI 1.4 port on my mobo. Will think about it for a couple of months before doing anything about it and hopefully that will improve the 4k/UHD experience for me.
Using VLC player some MP4 (AVC/x264) videos which were playing smoothly on my full-HD display are tending to drop some video frames in 4K. HEVC was always a lost cause. Though the 4K videos on Youtube seem to be playing fine but not as buttery smooth as it was on on even 30hz let alone 60fps.
Overall, very happy with getting this monitor, I'm just nitpicking the faults - and there is some room for improvement by moving to a 60 hz capable CPU or GPU.
I should say watching those 4k/UHD videos is the best part of all this, all that glorious detail for the eyes to behold!