I use a Kindle Scribe for reading eBooks and occasional note taking.

Personally, I like the bigger form factor better, both for reading and writing, could even be a bit bigger for reading PDFs.

After a short period of writing on ePaper, I'm now back to real paper. It's just a much better writing experience, lighter in the pocket, cheaper, more flexible (rearrange, give away, lay out on a table), more practical (write while you read, use big sheets when you need it), etc., etc.

A folded sheet and a small pen is all it takes. ePaper for writing might have a use case in professional workflows, but for personal use, it's a nice idea in theory, but not in practice, in my opinion.