(Raleigh, NC USA)
I bought two of these to use with my 2017 15-inch MackBook Pro. I use USB-C to DisplayPort cables. The Mac drives the two monitors very nicely (along with the built-in display). I have a massive amount of screen real estate now.
Over the past few years, the Mac's retina display, along with super high-res phone screens, has spoiled me, and I can't stand using lower res monitors like my 23" 1080p display (95 dpi). I've been waiting for 4K monitors to come down in price, and it seems like that time has arrived. This LG is 138 dpi -- it's not as razor-sharp as the Mac's onboard retina (220 dpi), but it's a huge improvement.
One small caveat, which is probably a Mac issue more than an issue with the monitors: when I wake the Mac, sometimes my windows are rearranged a little bit.