I've had good luck moving the mobi files over but am also not seeing the covers unless I use the "share" option. Now it gives me the annoying "Personal" banner at the bottom and now shows in docs rather than books but I can live with it. Interesting thing is that when the cover does not show in the book list it does show when I long press on the book to go to the options screen. Anyway, will use the "share" option and hope for smart people to figure out if there is a better way