My favourite e-ink application was in the Yotaphone II [1] some years ago, but sadly discontinued. I had one sent from the UK to Australia, where I was working for a few years. Reading books, docs or emails via the e-ink screen was a joy (no probs with bright sunshine), as was calling up your airline pass on the screen and turning off the phone, because the image on the back was retained. Even writing emails/docs was fine for me, despite the e-ink lag. I needed to charge it only every other day, and that still left plenty of margin. Best phone I ever had.

[1] https://www.gsmarena.com/yota_yotaphone_2-6959.php

I love the "it's trash day" being represented as a full trash can on the desktop!

Very cool!

I linked my framed e-ink newspaper build elsewhere in the thread, here's to e-ink hacking :)