I have this as well, and I like it, but it's quite difficult to find a computer capable of driving it at 4K and 144Hz. You can only do that if your GPU supports DisplayPort Stream Compression. My GeForce 960 does not, so I can only drive it at 95Hz (I'd buy a better GPU, if I could find one...). It doesn't support HDMI 2.1 either, although there's a newer model, the 27GP950-B, that does.

It's kind of funny to me that the limiting factor in high-res, high-refresh-rate display technology is not so much the panels but the bandwidth of the cables and connectors.