I have the ASUS PG278Q and I was unfortunate in the beginning to have a dead pixel in the middle of the screen. Then putted it away in the shelf for about 6 months and when getting it back out, it was fully functional again, no dead pixels.
There are some very small BLB in the left bottom corners, but that's about it. I must admit and be honest here that I am very disappointed in the absurd "quality control" these monitors have, especially given the immense price that you're paying for them. Might as well sell your kidney as you'd most likely have less issues than with these monitors.
I have gone through an Acer Predator X34 and an ASUS PG348Q (both IPSs) as well, both had massive BLB that it was absolutely horrible. Especially when having a dark background, as in movies etc, you'd see the BLB all around the monitors.
And these were even more expensive than my PG278Q, so I returned them both and stuck with my TN PG278Q and I'm glad I did. Sure it's expensive, but I call myself pretty lucky with my small amount of issues on my monitor today.
I know that Dicey had major issues with his and got like, what? 7 total returns of the same monitor? Due to the lack of, again, "quality control" and them being refurbished rather than actually fixed. So yes, in comparison to him, I feel very lucky having this monitor today.
But I also didn't have a painless start as mentioned above.
My advice to you... Don't go IPS, atleast not today. TN may not be as "awesome", but surely, from a day to day basis, I can bet my ridicolous salary that no one in here would even notice the difference of an IPS compared to an TN. Unless they would be side by side. Which the average user doesn't really have or use, on a daily basis, to be honest.
Like AngryGoldfish also mentioned above, maybe in a couple of years IPS has matured enough and the quality control has come to an acceptable level, in comparison to the prices the manufacturers are asking for their products.
