Godly. You feel like you are looking through a periscope when playing 16:9. I will not even consider another resolution moving forward. The only downside is when games dont support it (Heroes of the Storm makes you play with black bars on either side).
Hopefully good, that's what I will be upgrading to soon (just 1 though)! Only on a single 770 right now, and 90% of games I can play just fine with a few tweaks to settings (except the obvious ones like GTA5 which needs downscaling to 1080, hopefully 980Ti will resolve the need to do so).
1 - Some people complain of a "red tint". I only notice this on an all white screen, but it is VERY VERY slight, and not at all intrusive, especially after calibrating it (I just did so by eye).
2 - Colour banding is much more obvious than on my Dell IPS monitor (bad image compression of website backgrounds most noticeable). Big example is Steam, where it transitions from Black to Blue from the outside to the middle of the screen on the website background. You see the gradient changes far more. I assume this is due to the contrast ratio.
3 - The "Faster" and "Fastest" pixel response settings are a joke, I dont know what they were thinking. The pixel change overshoots so much and leaves black bars behind things as they move across the screen. Just use the "Standard" setting and its perfectly fine (and even better than my Dell IPS). You can see what I mean in the PCM review
https://pcmonitors.info/reviews/samsung-s34e790c/.