Resolution is the big compromise with color e-ink, the effective pixel density is cut in half when the color layer is enabled. With the current best panels you

Resolution is the big compromise with color e-ink, the effective pixel density is cut in half when the color layer is enabled. With the current best panels you get 300dpi in mono mode but only 150dpi in color mode, and fidelity of the mono mode is compromised compared to a mono-only panel with the same resolution. The color rendition still isn't great either.