Well, this is a e-reader forum, and I don't believe any of the e-ink tablet are going to be as good as purpose-built e-reader like Kindle or Kobo.
That said, the market for e-ink writing tablet is definitely there. It's still a niche, but it's there. There are many people who have gone total paperless with either the reMarkable, the Supernote, the Boox, the Papyr, the Quaderno, etc. These device are usually much lighter than iPad or Surface, and has longer-lasting battery.
Personally I think it's still too early for color e-ink tech, and generic Android on e-ink is still not very good, but without intermediate products they probably won't improve. I think the Chinese market is plenty big for them to make money -- tons of e-ink tablet maker in domestic market.
As regard for generic e-Ink tablet, the development pace is quite fast right now, so I am not surprised if the latest release is considered "the best e-ink tablet".
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