Honestly, I really don't think BTSync should be compared to dropbox, it sends the wrong message. When people say 'dropbox alternative' people immediately think "Oh cool, so it can do everything dropbox can do?" Which we all know isn't the case here.

The best thing about BTSync is it's basically zero configuration. I have it running on 10 of my boxes so far, and it's working amazingly. Far better than dropbox -- however, I only need it to sync files between hardware, not for anything else, like photo sharing, or advanced configuration based sharing. I just want file A, to be on all configured servers.

TL;DR: Don't compare BTSync to Dropbox, it's not a dropbox alternative. It's something completely different, entirely.