The only thing that I use the Marvin XD plug in for is to sync the what I will call meta data between devices and calibre. By that I mean syncing the category, read and reading percent data. I use the OPDS to download books onto my iPad. The Marvin XD plugin is also nice to make sure that I have all the books in Calibre downloaded. From my point of view, it's more a convenience than anything else. I can still sync where I am in a book between devices via dropbox. It's just a case of remembering to make books as read on all three devices (mac, iPad and iPad mini) and manually syncing my reading list.
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