The only real issue I have with epub is the longer load time for the toc. Perhaps the justification issue too but that's a Sony issue now rather than just an epub one. I never see any crashes or any other problems on my PRS-505.
Any delay in chapter loading is very very small for me even in those books with very long chapters. It's only a fraction longer than a page turn.
All my ebooks are now in epub format. LRF doesn't seem like a long term solution since it's only used on the Sony readers whereas epub is gathering momentum and more and more readers are supporting it.
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