I've got a Planar IX2790 and it's great. Article is spot-on re. scaling -- it's much nicer to look at all day (native 2x scaling) vs. 4k at 1.5x scaling.
It looks like the main concerns on this are around stuck pixels. Have you gone through calibration / QA on yours? [2]
Otherwise, seems like a compelling alternative to the Ultrafine.
[1] https://www.reddit.com/r/Monitors/comments/8zomas/i_just_rec...
[2] https://www.reddit.com/r/Monitors/comments/e5n9y5/planar_ix2...
I haven't bothered calibrating it.