I am one of those who got it on sale and haven't posted anything; in fact, I joined to post this. My story was more favorable, in that I ordered mine late Saturday night and by Tuesday morning it was sitting on my doorstep. It was wrapped on the outside of the box with 7+ layers of bubble wrap. Out of the box, I was surprised at how heavy and well put together it seemed, the metal bezel being an extra nice touch. This monitor replaced an LG 39" TV as my primary screen. In fact, the UHD420's pedigree was confirmed by the other LG remotes (power on/off, at least) working on the WM.
The screen itself is really amazing ; I was shocked at how bad it made every other display in the room look. It has actually put my on the path to considering upgrading my main house 70" Sharp tv to a 4k TV. Mine was indeed pixel perfect and with the setting dialed-in looks incredible. Note though that I never had a 1440p display of any sort. 1080p looks great to acceptable depending on the content; the scaler seems to do a good enough job but isn't going to do miracles. 1080p streamed content looks really good, for example, but 720p not so much.
Outside of some ARPGs at 1440p, I haven't done much gaming. I am driving this with a single R290, though, so I imagine any native resolution FPS style games will probably be an exercise in frustration.