I have a lot of PDFs as well. I think you can make them a bit more readable by cropping off the margins for the Gen 3 (I have Acrobat which does this with ease). Unfortunately I can't test this because I'm on the NAEB waiting list at the moment.
As I understand it, the best eink reader for PDFs is the Iliad but even that has some issues (and it's pricey).
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