Is there a good, full-featured EPUB to PDF converter?

Does Calibre work? It offers Ebook Format Conversion for a lot of formats, quote from the FAQ:

Calibre supports the conversion of many input formats to many output formats. It can convert every input format in the following list, to every output format.

Input Formats: CBZ, CBR, CBC, CHM, DJVU, EPUB, FB2, HTML, HTMLZ, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, SNB, TCR, TXT, TXTZ

Output Formats: EPUB, FB2, OEB, LIT, LRF, MOBI, HTMLZ, PDB, PML, RB, PDF, RTF, SNB, TCR, TXT, TXTZ

You can try Go4ePub.com.

According to my experience the results are slightly better than with Calibre.

I recommend to try this free online converter convertio.co , I have used it for a very long time without any problems ever!