While the display offers great contrast ratio, it's not the brightest out there. (androidauthority.com)
The display is beautiful - it looks clear with great contrast ratio and nearly everything looks great on the smaller display, whether it's the 38 mm or 42 mm option you go for. (t3.com)
I am buying the Cybook with «OED» technique that has great contrast ratio that is equal / better than E-ink. (goodereader.com)