The PDF conversion is better than advertised in my experience. I converted a 400+ page PDF and it reads beautifully on the Kindle. The limitations are that 1) the converted document does not offer a Table of Contents that the Kindle recognizes and that 2) the navigation aids in the original document, like section indicators, are missing. The converted document is easy to read but difficult to move around in. I set some bookmarks as I scanned through the text to make it easier to find my place.