I greatly prefer dark mode for my normal monitors. I greatly prefer light mode for the eink monitor. My multi-monitor setup went exactly as well as you might imagine.

Also the eink monitor I bought for $1k is quite small by today's standards, so I couldn't utilize as effectively as a vertical monitor which keeps more continuous text visible at a time.

The tech on its own? 7/10. I love it and it only lost points because the driver documentation and accompanying tool interface wasn't fully translated from the original Chinese. Ghosting issues and a relatively slow refresh rate were known tradeoffs at purchase time. so can't fault it for that.