I, as an equipment designer, would select an e-ink color display for my main feedback if: - it was battery powered and needed a display with infrequent updates

I, as an equipment designer, would select an e-ink color display for my main feedback if: - it was battery powered and needed a display with infrequent updates but super low power - the display was otherwise a large part of the power (i.e. otherwise it was a LCD display) - the color was useful in indicating an error or clarifying the menu items If it did those things it would be worth upwards of $10 a unit to me if the resolution was over 720p for sure, and likely even for lower resolutions if it worked reliably with a slow microcontroller.