A great alternative to other cloud based storages. Allows me to have separate folders synchronized with different parties, and not worrying about storage limit.
Improvements Id like to see: The iPad version supports hiding left side bar. Mobile versions support displaying thumbnail of photos. Also, an option to limit sharing to local area network, and remove dependency on having a remote server as directory.
Given this is only beta version, its very well done.
Rsvaaa about BitTorrent Sync, v1.4.103