I'm using BitTorrent Sync for 2 years. It's running on my notebook, pc (both Ubuntu Linux), tablet and mobile phone (both Android). Last week, I got a new mobile (Windows Phone) - unfortunately, on this platform BitTorrent Sync cannot run in background and the location of the synced directories cannot be specified. But I still got my documents, pictures and music synced between all my devices, no matter on which device the latest data update occured. As I don't want use a cloud-based solution, BitTorrent Sync is the perfect tool for my needs. It's reliable, fast and secure. Keep it up!