This is the A7 which is an older version. I would make sure it still has 4G support otherwise no carriers will support it in the US
Presumably, the refresh rate for it is even worse.
According to the product page, the refresh rate is equally as fast as the b&w refresh.
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.