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It's what I thought, needs front-light on or sunlight to actually use at all, due to much less light reflected.
Colour is poor for maybe three reasons: Compromise half-pixel filter coverage to allow more reflected light, only 14 shades of grey as well as black and white (poorer white than any eink ever) and possibly less dense colour filter to improve brightness.
At 6" it's also too small for many colour applications, so a very niche eink and eink itself is niche. For most colour documents a 10" or larger tablet is needed. Entry level is Android at about $100 and posh level is the iPad from about $400, certainly the iPad screen resolution is much better than the ordinary Android tablets, so better value than the Apple Watch or iPhone.
Really I'd not pay $100 for it. I might consider it as a novelty purchase at $50 or less.
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