Who has experience using E-Ink readers to read PDF files?

Question

Electronic books

Actually, the essence of the question is in the title. To be a little more precise, it's interesting:
1. How comfortable is it to read PDF and DJVU (roughly speaking, scanned and stitched books) with formulas and code?
2. What diagonal is comfortable for reading?
3. What models of readers are generally relevant? Has anyone met Chinese nouns?
Thank you.

Answer 1

1. I had to update the firmware, because. the beech was very slow when opening the pdf. those. if we get lucky. If the book is with an android, then you can make it quite readable.
2. to each his own. I think that less than 5 "is not convenient at all. But I personally know people who read books on a phone with a diagonal of 1.3" Another thing is that beeches larger than 6 "are less common and much more expensive.
3. I, the whole family, have Onyx boox Everyone is happy, although in fact the same China.

Answer 2

I own Kindle DX
1. Small ones are inconvenient. The page is usually completely updated when turning over.
2. Like DX or more (but depends on pdf).