I installed a good OED from 1930s on my Mars which needed KOReader for epubs. Links are on this site.
Never felt need for KOReader on Kindle or Kobo (and Sony is OK too), but the Mars stock reader is only good for PDFs.
I did install KOReader on the Elipsa, but purely to easily crop & adjust contrast/brightness on scanned PDFs, which the Mars stock reader does even better. I don't really use it for epubs at all.
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