Sorry, got the answer to my own question from feednooks:
Lack of justified text: While we can display advanced ePub files on the PRS-505, with embedded fonts, CSS, SVG and even XSL-FO, Adobe doesn’t provide any sort of support for justified text yet. Justification and hyphenation are the two main reasons why I’m still using PDF files on my device. Sure, it should be fairly easy to add support for justified text in the future, but it doesn’t make any sense to support something as advanced as XSL-FO first.
Honestly, that's very poor. I don't see myself using epub until justified text is sorted out...
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