[rpedroso]

There was some concern about the security of the product:

http://2014.hackitoergosum.org/bittorrentsync-security-priva...

These concerns were amplified by the difficulty of auditing a closed-source product. Their argument that hashes are one-time secrets and not permanent keys is difficult to validate without access to the source.

[lewisl9029]

I personally switched to Syncthing (and the Syncthing-GTK GUI) and never looked back.