the version you linked is a monochrome one, right? Don't you find it difficult to read and work on it without color?

Yes, it's basically a large Kindle.

For reading and work, I actually prefer this experience. The contrast for text is way better and more crisp than regular LED/LCD/OLED displays, unless you turn the regular display's brightness way up, until which point my eyes hurt from all that light emitted. This was my primary reason for buying such a display -- I love my Kindle and want to use it more, but I couldn't.

Now for entertainment you are obviously limited. For informational Youtube videos you could be getting by alright -- you don't really need to see colors for those. Games is tricky since you could only do non-demanding ones. Shopping gets tricky since you can't see colors. Sometimes I find myself hopping on my iPhone to check before placing orders.

I have both, a Boox Mira pro (monochrome only) as well as a Dasung Color EInk Monitor.

You actually get used to the monochrome thing. I've adjusted my syntax highlighting to use more italic, underline, bold etc so you get by without the semantic coloring.

The color eink is way better though. Only downside is that it has less contrast than the purely monochrome one. Color makes up for it nicely, though. Plus the refresh rate on the Dasung is way higher, so you can actually use a mouse without going insane trying to predict cursor movement.

Where the monochrome monitor was more of a secondary display primarily used for coding, I'm now using the Color EInk one as my main display.