Thanks for this idea. The design looks surprisingly like the old cinema display. Actually, apparently they use the same glass from the cinema display but no camera. [1]
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.
I believe the theory that it's 5k iMac panels that Apple rejected. I have a few stuck pixels but I never notice because they're so small. I have a blue stuck-on in the lower-right quadrant and I can't even find it now.
I haven't bothered calibrating it.