Hi,
I've just bought the eizo 2231 and have to say that I've not obserwed any of the color shits (greenish + red ) I've read about here - although mine's from a relatively new production series I presume.
On the other hand, I've got the slight X backlight pattern, yet it is not visible with even dim ambient light - only when the monitor is the only source of light and it projects a completely black screen - well, not a likely scenario for day to day use, so its not a problem for me.