My LG is a little over 4 years old (an LG 27MU67, sadly no longer produced), and the only complaint I have with it is that the capacitive buttons are difficult to use by feel. If I could get another monitor that's exactly the same, I'd do it in an instant.
I have a similar LG 27UD68. The game changer for me was taking off the anti glare coating. It's amazing the relief from eye strain that I got once it came off.
For later reader: I've figured out I need to use the Display Port, not the HDMI port, to get true crisp 4K. Now the LGs are sharp too. :)
>6 4k monitors
How are you driving those by the way? 6x 4k support is an uncommon feature.