Epub's fine for most fiction and a lot of nonfiction. It handles text (even a lot of non-Roman script) and illustrations very well. But as long as formatting/font support is so limited in epub, PDF will have its uses. I have a large quantity of math books and papers on my device that would be impossible in epub. And the Story HD's resolution and zoom levels mean I can read them great. But I understand most e-ink readers don't handle PDF well.
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