Yeah, give us some feedback
I just got my UP3216Q this evening. As I mentioned earlier, I'm going from two Dell P2715Q's to a single monitor plus the laptop display.
This new monitor is GORGEOUS. It's HUGE. The difference between 27" and 31.5" is massive on my desk. I really don't think I'll miss the screen real estate of the two 27's... I think I used to waste a lot of that screen real estate anyways by making apps full screen that just added a bunch of white space.
With regards to the scaling modes, I can run in 4K with no scaling. It's usable, but too small for my 40-something eyes. I am running between the "looks like" 2550x1440 and the no-scaling, and it's just right.
I was concerned that by decreasing the PPI from 4K at 27" to 4K at 31.5" it would mean I would see pixels, but that was unfounded. I really have to get about 6" away from the screen to start to faintly make out pixels, and even then, it looks smooth and great.
I honestly think 5K at 27" is kind of silly after seeing the UP3216Q. They should be making bigger 5K panels!
Other niceties of this monitor are the built-in USB hub, and there's a convenient card reader in the side of the monitor. It has plenty of connections to run into multiple machines, which is great. Works with Mac and my Surface Book.
I have yet to calibrate it, but it looks amazing out of the box.
I'm very happy with it and glad I bypassed the LG 5K offering, at least for this time around. The LG would have meant I could only use it with the Mac (or maybe new PC's to come that I don't yet own), and to call it "the ultimate dock" is ridiculous. It's a powered USB-C hub - you would need a bunch of dongles hanging off the back of it to be useful. Actually, it only has 3 ports (not including the one to the computer). USB 3.1 adapter, thunderbolt adapter, ethernet adapter... and then you are out of ports anyway.
So, I can highly recommend this Dell so far!