I love the eink technology and have been happy with a reader bought about ten years ago. However, nowadays, I find myself mostly using the ReadEra app[0] on my phone (no affiliation).

It being an app on my phone means that I always have my book with me and can read during any break time in the day. Plus, it deals with pdfs very nicely which turns out to be surprisingly useful when reading other things such as scientific papers and technical books.

[0]: https://play.google.com/store/apps/details?id=org.readera