Quote:
Originally Posted by odedta
It's good practice to pass your file through validation, if you write your ePub with the right syntax in the first place you would be able to count the errors generated by both calibre and epubcheck on one hand.
I really don't understand your(and some others) "disgust" towards epubcheck.
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EPUB check
Mostly, Less user friendly error messages.
No auto-fix helper tools. Not even a Jump to error
Sigil (flightcrew)
Very rigid rules interpretation, but a more verbose and connects the error by a
jump-to tool (in most cases)
Completely fails to identify the target location of (unknown) references (usually in the OPF or NCX). There are 2(+)
ends of any good reference
. Or Sigil would not have known it was bad 
Calibre (editor)
IMHO Beats Sigil in the user friendly department: Messages (really verbose) and suggested
fixes (tools)
Fails (the editor part) to clean a (guide) entry when deleting (unused/unwanted) files via the UI
Personally, I now use both (and on occasion: the hot link to W3C's CSS validation )