The Boox Palma2 is a portable e-ink device shaped like a phone with limited distractions and a long battery life. It has a front light for use in darkness, Bluetooth connectivity for audio ...

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.