Just got my two P2415Q displays delivered by Fedex and hooked them up to my nMP. These are definitely much less heavy than the UP2414Q and, so far, run much cooler than it, which makes sense, since the
teardown of the UP2414Q showed it had 3 display controllers running in it because of MST, while I assume these just have one each for SST. Had a strange experience when I started the computer up where the displays were being mirrored and the System Preference wouldn't come up, but I shut down, restarted with one monitor attached, waited till it started up, and then hooked up the second one, and everything was ok. I'm hoping that was a onetime thing, but then again, there's no reason to expect that the 4K compatibility issues are going to disappear - I've used 3 different 4K monitors with this computer and all had compatibility issues - so at a certain point you know it's not the monitors. At least the MST issues should be gone.
Display quality looks great. Anti-glare looks fine to me, these seem like monitors you can stare at all day. I'm running at True Retina resolution - "Best for Display" 2X mode, so the scaling of everything is perfect and looks as good as my rMBP. Assuming the compatibility issues don't start to creep up (and I fully expect they will), then these are great. The build quality seems fine. I'd say they're better than the Samsung 27", nice solid stands with easy adjustment, but obviously not as as good as something like the LG. I'm not running any apps where I'd see the difference between sRGB and Adobe RGB.
