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They can only do pastel shades and are poorer for monochrome than other current eink. They are a niche for coloured comics for people that don't want to use an LCD tablet.
It's basic physics. The richer and better the colour, the dimmer the page is as the light has to pass the filter twice. LCD has a backlight so the light is attenuated once and can be bright enough. The eink is an opaque milky coloured liquid with black balls at each dot. The eink only does 14 gray shades as well as black and white. The LCD can do 64 to 256 grey shades, thus has approximately 260,000 to 16,700,000 combinations of shade, brightness, colour etc. The eink struggles to do 4096.
Also you have to sacrifice either 2/3rds horizontal resolution or 1/2 vertical and horizontal to have colour (subpixels). So ANY LCD, OLED, eInk or CRT is lower resolution in colour than if it had no colour.
So eink can't be any better. There maybe be some other technology that can passively do colour and once Mirasol was thought to be a solution.
Color eink is a niche. You need the front light on, or better ambient light. They are worse contrast and resolution for mono text and poor colour.
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