Glad to see some conversation with a mix of opinions, though @craigb and I seem to be in the minority so far. Another point is that I am at the exact distance from this monitor as I was from the two side by side.  Since it is running at true 4k (100%), the size of each 1/4 of the screen is exactly the same as my old 21.5" 1080p monitors).  It does't feel "too close" because it is exactly the same.  In fact, when I first started using it, to get used to it, I just put two windows side-by-sid