I've tried this setup (and a different setup using a capture card) with a BOOX Note Max but the input latency is just too high to be usable, even for simple cli work.

Are the dedicated eink monitors (like Dasung) better in this regard?

I've been using this solution for about 4 days now. It's not meant to be used as your main monitor. I use it only when I want to read something I or someone else has written. I think it's also good for simple writing too. But if I try to use it as my main monitor, browsing the web, writing code, etc. it will become a real headache because of the latency.

One huge plus is that it isn't *just a monitor*. because of the VNC connection, I just pick up my tablet and roam around the office while reading something, even making tiny edits, It can be also used as a great drawpad. I use it to explain things to my coworkers, since drawing freehand diagrams, shapes and text isn't very easy with a mouse.

Yes they are significantly better. But no battery so no portability.