Inherently only good for monochrome. Adding an R G B filter to have colour may be a little better than current filtered eink, but physics and mathematics prove it will still be rubbish without a lot of front lighting.
We'll have a better idea of it when someone releases a 300 dpi mono reader using DES. It may be just a ploy to get round patents and not much different. There is nothing wrong with the sharpness of a PW3, Oasis, Kobo Libra or the 7.8" 300 dpi models.
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