Boox is known for making e-readers that push the limits of e-ink tech, and the new Boox Note Max is a good example. It's a massive 13.3-inch digital notebook with a long list of note-taking features ...

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That's why the Onyx Boox Note Air4 C, a $500 digital notebook and annotation tool, offered an alluring alternative: Mark up e-books and PDFs as much as you want -- and in color. I was intrigued.

The Boox Note Air 3 is still a sleek ... an Onyx product will feel a little clunky, by comparison. Part of this clunkiness comes from E Ink being less responsive than the traditional color ...