Thank you both, DiapDealer and mrmikel, for the down-to-earth discussion of the cons of EPUB3 for existing devices. Because 90% of the work I do involves designing textbooks that are currently destined for print first, with many graphics and specialized formatting, I'm beginning to work with fixed-layout EPUBs from InDesign CS6, and so it's my understanding that EPUB3 is a necessity for these, and it's more likely that they will be read on tablet devices. For the other 10% of books that I do, I will definitely stay with EPUB2.
The problems that I had were reasonably easy to solve, and helped me begin to recognize the difference between the two formats within the HTML/XHTML and CSS files.
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