I have the Reunion IPad app, and have tried synching with my Reunion tree on my Mac. It automatically updates from one to the other, but my experience is that it creates errors. In particular, the Notes for an individual sometimes appear under someone else's name, and not under the person where ther were created. I suspect this might happen because I have a relatively big tree with over 25,000 people. I no longer use the sync function, which makes the whole IPad app somewhat useless for me.