I play chess on a e-ink smartphone and it is a nice break for my eyes in the evening.
I can not wait for the moment when I would be able to code on a nice colored e-ink desktop screen
I went through that and then bought a Carta 1200 display BOOX 13.9 and it's amazing. Black and white only, but the contrast makes the device usable.
If you know you won't return the device, get it on their website because they'll give you extra pen tips and a case. I got mine on Amazon, so I missed out on the extra stuff because of my return experience.