... The colors are also likely to shift as you move your head...
This is what ultimately lit the fire for me years ago to replace my consumer-level monitor. It was calibrated and profiled and I was able to get by with color correcting artwork reproduction on it. Was having one of those "what is wrong" moments, when I knew I should wind up much closer with the colors I was working with. Re-profiled my monitor, spent a bunch of time checking everything.
Then, I got out of my chair to head to the printer, but luckily gazed at the screen while getting up. Saw a huge color shift. Then I realized the monitor was off-tilt just a little bit. That's what cost me hours of headache. Then once it clicked I started playing with it, and could see the color change as I scrolled parts of it away from the center to the bottom of the screen.
IPS monitors don't have this issue, at least not nearly to the same extent.