I've seen two current Onyx Boox color ereaders. For mono under ambient light they are worse than the original Sony ereaders and K1, K2.
Unless you want coloured artefacts on the mono text and line illustrations, the mono has to be at best 150 dpi, because it's a 300 dpi mono screen (at best, some are less) with a 2 x 2 pattern of coloured dots.
So I read mono text on my mono eink models (currently 5" to 8") and Coloured content, or PDFs that don't work on 8", on Nxtpaper 11 or Nxtpaper 14.
If you are using the front light on eink, then the Nxtpaper 40 phone, Nxtpaper 11 and Nxtpaper 14 are practically as good. The Sage is only better in sufficient ambient light to have no front light.
I can't remember reading any actual novels that had any colour. Any that have illustrations are mono, and majority only B&W, no greys/half tones.
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