I'm curious how well the same PDF works on different PDF-compatible ebook readers. For testing purposes, I recommend uploading
this PDF (a tabletop role-playing game book) on your ebook reader and testing how smoothly your pages turn with it - it's one of the most graphics- and layer-intensive PDFs I know and my iRex DR1000S choked on the PDF fairly frequently.
(Note: Yes, the above download link is located at Rapidshare. However, the entire PDF is under a Creative Commons Share-Alike license - as outlined on page 7 of the PDF - and the authors did in fact upload the PDF to P2P sites themselves, so downloading it is entirely legal.)