Android is a bit of an issue.
For Mac and iOS iBooks is best. On Windows, Readium for Chrome is excellent.
Would you recommend a different way of doing it?
Seems un-necessarily tricky to publish to all platforms when it's what clients insist on.
(out of 10k clients there will be a huge number on android who can't read it)
Native app maybe? Bit beyond my pay-grade but I suppose I could outsource it.
I think we all need to be patient right now. I’m sure the reader apps will start catching up with the EPUBs just like web browsers started to catch up when new technologies hit the web.