Quote:
Originally Posted by Divingduck
... and a calibre user can learn a bit more about how ebooks works, how easy it is to modify ebooks and by this way expand own capabilities.
It is less destructive (in respect to conversion) and makes fun too. Sure, you will spend in the beginning (a bit) more time in a learning curve, but in the end you'll be much faster and don't waste time with endless try and error experiences ( ... and never knowing why things are going wrong).
Not all times a bad thing 
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You only change what you need to. Conversion introduces other (even if minor) changes. A well formatted book, take only a dozen seconds to adjust to your liking. A poor, or multiply converted book can thake a half-hour to untangle.