I don't have a problem with the lag at all, I hardly notice it and it's quicker than a page turn of a pbook and less hassle.
I've recently been reading more pbooks, especially in bed, where I read a lot so I can sleep.
It's much more of a faff turning pages with a pbook, holding the book up with the pages open etc laying in bed than it is compared to an ereader where I can just tap the screen.
That and the ereader is backlit as well, so less disturbing for my wife.
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