While AeroFS is good, I think that in the coming months I will be switching all my data sync over to BitTorrent Sync. I am currently using it to sync one folder between my laptop and a server in another country and see that it matured to the point that sync is reliable. Moreover, it offers some serious advantage over AeroFS (which is going to focus on enterprise), and it is that it works on Windows, Linux and Android/iOS. I now spend more time in Linux, but my shares are on NTFS volume, and AeroFS refuses to work with fuse-mounted volumes, while BT Sync just keeps going. And Android/iOS apps perform real syncing, which is a pure win.