There are different formats of PDFs and lots of ways of creating and lots of options on creation, such as reducing file size/embedding things like images and fonts etc - these reasons are likely to explain some of the different reported experiences. If your source PDFs were created in a mobipocket conversion friendly manner - you'd likely get a good result - if not ...
so far i've only tried a few short docs and have had fair results, with maintained images and text styles (haven't done anything with a TOC yet or links). I'll report further when I've do a little more testing.
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