I was using Mantano premium for a long time but recently switched to using Moon Reader pro more and more primarily because of the dropbox sync. I use it and it's very reliable. It not only syncs reading position but, in the paid version, also all notes, bookmarks, and highlights.
Mantano is still a little better for formatting and looks, but Moon has gotten better of late in that department, and the dropbox sync is just too valuable to give that up now.
For all those having problems syncing, are you at least getting the pop up message when you open the book that a new reading position is available and giving you the option to accept it or not? If not, then there may be a few problems with your setup.
The paid version is on sale through end of day tomorrow for 50% off.
--Pat
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