I did try it on an ePub of mine. I've got a working and very usable file I could import in LO.
- All paragraph styles merged in Textbody style. Linebreaks were rightly maintained.
- The hierarchical structure of the file is maintained (h2 titles preserved).
- One thing that maybe could be improved is that the endnotes links disappeared.
It fits its initial and declared purpose: to allow checking the text in LO.
It also can be used to quickly reformat a standard but "strangely" formatted ePub without fiddling and correcting inline styles or other quirks.
YMMV It's worth a try.
Thank you.
