I bought the Asus 6K ProArt on launch, replacing an older 4k 27" Dell monitor. The new monitor is definitely an upgrade, but not as great as I was hoping. The matte coating is by far the worst part of the monitor. It's not bad enough to return the monitor, but the graininess is noticeable on white windows. I've definitely enjoyed having the extra screen real estate over the 27" monitor, and the extra resolution has been very helpful for having a bunch of windows open in Unity.

This year at CES there were a number of new monitors unveiled that compete in this space. There's a new Samsung monitor (G80HS) that is a 32" 6k with a higher refresh rate than the LG or Asus. Unfortunately it has the matte coating instead of glossy, so clarity will suffer.

Also of interest are the new OLED offerings with true RGB stripe subpixel layout. This should fix text rendering problems on systems with subpixel antialiasing. Both Samsung and LG are making these OLED monitors with the true RGB layout. There will almost certainly be glossy coatings offered with these panels, and they'll have higher refresh rates than IPS.