Sync is unreliable
I had the iOS and OS X versions set up to sync using Dropbox. I had not used the OS X version in a while but had regularly synced the iOS version after using it. When I went to sync the OS X version, it overwrote the data entered in the iOS version even though the OS X data was old. If I had not had a backup, all the entered data would have been lost. This seems like very poorly implemented syncing when it cannot tell the difference between old data that needs to be updated and much newer data that needs to be retained.
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