several links that i've found in other forums with positive and negative reviews. The main negative review is the user interface:
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http://osx.iusethis.com/app/calibre
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http://www.macworld.com/article/1604...6/calibre.html
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http://www.goodreads.com/ereaders/106-calibre
@Kai a perfect user interface doesn't require any manual or teaching. Although I agree that practice makes ease of use, that doesn't mean we shouldn't aim for a seamless interface.