My e-ink device won't even work properly in direct sunlight. Most of the screen looks washed out and it's totally unreadable. If I'm in outdoor light I have to shade the screen when I turn the page to make it legible. So I'm not so sure the "e-ink is readable in sunlight" argument holds a great deal of water. While I can read it in sunlight, I can't turn the page in sunlight.
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