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$400USD is with 40% off too! and it's really low ppi, not even up to my personal minimum of 350ppi which really makes for decent, clear reading.

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PPI really depends on the viewing distance. You're usually very close to a phone but much further away from a 27" monitor and further away still from a 65" TV.

I'd say for a large 13-inch ebook reader, a 167ppi grayscale display (for anti-aliasing) is pretty good.

Until very recently all ebook readers were around 167ppi (most of them 6 inches diagonally) and most people were OK with it.

The high prices are due to the eInk panels, they must have a very low yield at large sizes making them very expensive.

I agree on distance but there is a massive difference between an 8" device with 300+ PPI and one that's 224~ PPI, and if I'm getting a slightly larger device I'm going to want it as sharp as possible, it's a bit like having a 27" monitor - they look dreadful at 1080P, and I think they're only just good enough at 2160p which is generally 163 PPI - now you can really see the difference between that and a 27" 5K display at 218 PPI which lots a lot clearer.

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