Delphin,
there is no good or bad ebook format and not because I like Kindle the ePub is bad or viceversa. What people needs to understand that the real issue here is DRM, not Amazons or Kindle.
And not sure why you're saying that converting via Calibre is a hassle, it usually takes 60 seconds or so. All my books are computer books, with lot of graphics, SQL code, etc, and I've never had any problem converting from ePub to mobi of mobi to ePub....never...ever...
Calibre conversion takes some CPU resources so I would not blame your issue to the format itself but your machine's resources. It is a simple and easy process on modern PCs.
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