I've been using BTSync since 1.3. Subscribing to a "decentralized" service is unacceptable to me. I have more than 10 shares, some from friends I've introduced it to. I accept that this is commercial software and would consider paying for the client. Even so, the Android-Mac synchronization is not reliable enough to make it worth a meaningful amount of money. BitTorrent was building something big and they threw it all away with 2.0. I'm testing Syncthing now. So far, it seems to fix everything I didn't like about BTSync.