The quality of the conversion depends on how the PDF was created. Some PDFs convert almost perfectly and others look like they came from another planet. You might also try different options (like layout versus flow). One might give you better results than the other. As for different characters, that is usually an issue of different fonts being used and not properly converted. Another possibility is that you used OCR on a graphic of a document. ClearScan is not what I would recommend if you are going to export, but Searchable PDF. However, you are then dealing with the quality of the OCR conversion -- depending in large part on the quality of the original and the ability of Acrobat to recognize the fonts.
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