I ran a test ePUB a while ago and opened it in Sigil and Calibre. It seemed to work well enough, although I didn't have internet access to run it thru epubcheck. I was kinda evacuated from the hurricane.
I also didn't remember to check if the TOC had automatically generated or not.
Interesting thing is that the current version of Nisus is based on AbiWord- they even said they contribute to its codebase- which has seemingly had ePUB import and export since 2013.
So this looks like it could make AbiWord and Nisus Writer Pro a pair of "hidden gems" for writers who want to export straight to ePUB.
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