Dropbox is the bet solution I've come up with as well and have Calibre set up to save all the books in Dropbox so that it Syncs across devices. I have, however, found the Marvin does not suit my needs in this area as it limits Dropbox access to 1000 books and the books are not sorted in any logical way that I can see.
I usually open the Dropbox app on my iPad, go to the book in the Calibre folder and then open it in whichever reader app I want via the Share button.
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