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W/ tagged .pdf, one gets the option of having re-flowability along w/ a perfectly formatted representation.
W/ epub and other ebook formats which don't have a concept of size and position and page, one only gets reflowability, which means that one never gets a perfectly formatted representation, but always has to make do w/ how the page happens to be rendered by the viewer.
For me, ``good enough'' isn't. I don't accept anything less than perfect, and there are a number of printed books which I've purchased which I've never been able to finish because the typesetting is so bad --- similarly, I've found a number of ebooks to set so badly that I've been unable to continue reading them.
PDF is the only format (w/ matching viewer technology) which offers the level of control which is necessary to prevent stacks, widows, orphans &c. --- EPUB and the like desperately need improvements in their viewers to improve the quality of representation (at a minimum providing user options for justification and the like would be welcome)
William
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