Any experience with E-readers/ E-ink devices?

I think ADHD is related in many cases to sleep/tech. So I'm really excited for my Onyx Boox Nova 2 to arrive (a basic tablet running on Kindle-like "E-ink" good for the eyes and sleep).

I'd love to order an e-ink monitor too for inevitable late night googling and reading. Alas, Dasung seems to have a monopoly on e-ink monitors with a refresh rate fit for the 21st century so they cost upwards of 1k USD. Waveshare are an emerging competitor but they're not yet compatible with my primary OS and I guess their refresh rates are still poor.

Anyways, any experience with such devices? How did they impact your experience with ADHD and your life in general?