Yes, sorry, I was meant at least automatically sync reading position across devices.
In my experience, as cedhax says is not very reliable in any reading app but... well, at least for me is better auto that could fail than forget it and surely be not synced.
As svenlid says, perhaps a reminder should be enough.
In my experience with iBooks, if you go to the library before closing the app or before switching iPad screen off, normally position is synchronized. More chances to be successful if you wait about two or three seconds.
The way Marvin does is (was) perfect for me. Instead of sync on close, you sync on opening, and normally Marvin does not use to fail in that.
And of course, if you have switched off WiFi is your problem, not app problem.
And now some technicalities.
On app close, you have some time to do some stuff. If you have time to do it, it will be synced. But let's assume wifi connection is not good and you don't have time to sync. Using a proprietary cloud you've lost all your chances. However, if you are using iCloud, iThings periodically wakes up to sync the cloud, and if your info is pending to be synced, it will be.
Because a normal sync scenario is you finish to read in the night, close your iPad and on next morning, perhaps you have some minutes to continue your reading while waiting a taxi, or in underground or in whatever other circumstance... and you find your iPhone has not been synced... You normally don't left your 11" iPad and take your 12.9" iPad to continue reading because you are worth to (only in battery exhaustion)... I don't know if I've explained well or not.
More. What about 3 columns? 11" iPad is getting wider and wider... I will be the happiest of the men if your application will sync book position on close and had 3 column option...
