I just received mine.
The box it came in looked a bit dodgy (had clear tape on it and it looked like it was opened before, but can't be sure). When I've unpacked the monitor I found a piece of paper advertising the main features to be facing the panel itself, so it was backwards.
However...plugged everything in and I'm happy to report that there are 0 dead pixels, no "dirt", no BLB and the IPS glow is minimal. I've upgraded from a Dell U2410 (IPS as well) and this panel is actually better to my eyes: the blacks are darker and there is actually less glow. I never considered my Dell bad or having too much glow but this PG279Q I received is a lot better.
I've also received a Dell P2715Q 27" 3840x2160 IPS (still in the box) so I'll set that one up and compare the two monitors just to see what the difference is (in terms of blb, glow & such).
Not sure if I just won the lottery (giving people on other forums reported a lot of issues) but mine is 10 out of 10 so far.
I only tested it at 120hz (on a gtx 680) but there's also a g1 980ti waiting in a box so yeah, good luck to all the others, I have a GPU to fit.