Bear in mind that the actual eink panels of the same model can vary in quality significantly (sometimes) unlike CRT, LCD, OLED, Plasma etc, even apart from front light variation.
The Era I saw in a shop looked no worse than my Libra 2.
I agree that the only reasonable comparison is with the front light off, otherwise you might as well use Nxtpaper or any similar device (matte OLED/LCD) with comparable running time to an eink reader.
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