The "Vivid-Pro Cinema white" & Vivid-Pro Cinema grey", at least the 1.8 gain versions, were confirmed by EluneVision to be the same as the cheap Optoma GrayWolf glass-beaded screens. In other words, they have a ridiculous amount of texture (much much more than the HP screens). You see sparklies everywhere. That's one of the reasons I've been trying to replace the screen.
We just need to find out if the PureBright 4k material is the same as the HP material or not. I'm hoping 'not', so it's sourced from a different manufacturer, and then crossing my fingers it doesn't have banding.
This regress (from the HP 2.8) is ridiculous. Does no one make a high gain retroreflective screen with a narrow viewing cone that's actually acceptable? As I've said many times before, narrow viewing cone high-gain screens are absolutely essential for the lazy projection setup, where you don't want a batcave. I'm pretty sure there's literally no other type of screen that is as capable of maintaining the native projector contrast in these sorts of environments.