I find ePub works quite nicely on my 505. It does not look terrible. And it is not slow as hell. PDF is usually a terrible format. Most PDF just don't work well on a 6" screen unless made to fit the screen. Sure you can go to Feedbooks to get eBooks in PDF, but try doing so with one of the latest best sellers. Won't happen. You can also get books in LRF or LRX formats as well. But if you have a choice of ePub, go for it.
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