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Full user review
"Depending on use, far better than Dropbox, Box.net, etc"
Only app I know where I can sync any folder and preserve the organizational structure of my files. Intuitive interface, especially the Manage Sync Folders layout. Can share files, listen to music files directly from web. Works flawlessly on every device. Reasonable transfer speed (200kbps-4mbps). Outages rare - half a day in several months. Very reliable; have never lost a file.
This app solved two problems for me: 1) Preventing accidental file forking when switching between home and work computer (thumb drive transfer proved too easy to make mistakes). 2) Edit my large iTunes library and have changes appear on both computers.
There is a learning curve. The negative reviews come from mistakes in not understanding how it works.
1) If you already have the same files stored on more than one computer, delete them except on a master machine. Otherwise SugarSync will (as a safeguard), treat the identical files as though they weren't and put a lot of copies on each machine.
2) Know that once sync'ed, if you delete a file on your computer, it deletes it off SugarSync. It's SugarSYNC, not SugarBACKUP.
While the speed is acceptable, it would be nice if it were faster. I also use Egnyte (highly recommended) for customer-facing file sharing which gives me real-world uploads at 25mbps and downloads at 8mbps, and iDrive for backups (not recommended) gives me real-world 60mbps downloads.
If your goal is to mainly transfer files to other people or preserve point-in-time backups, SugarSync is not your answer. If you work across multiple computers and need to maintain the integrity of your files across each device, SugarSync is a champion.