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A PDF is a PDF, so yes for those. As for EPUB/MOBI, maybe if you're lucky to have a quality book release and a device with a screen large enough to display it properly.

I'd love a large responsive e-ink screen (with some basic colours) to use for coding. Imagine not having to stare at the glowing LCD for coding. I'd be so happy.

E-ink would suck for coding.

Imagine doing all your work over a really laggy SSH connection. That's what typing on an e-ink display feels like.

That's why I said 'responsive' e-ink.

If it is in an ePub, the Kobo or Sony can reproduce it. Just remember that the screen is 6" diagonal, with 600x800 pixels, though the display engine will resize and dither to greyscale in order to suit the eInk display.

My O'Reilly books render code with monospaced fonts on both the Kobo Touch and the Sony Reader.