I know that this is a very late reply, but I have extensive experience with Sync and have yet to be impressed.
We had consistent issues with some computers not syncing (information would be on one or all computers but one, for example) and that would never fully sync, no matter what we did. Sync could never give me a good explanation. We’re quite a small office but they didn’t seem capable of meeting even our limited needs. We do have a lot of files that were to be sync’d, but it was so unreliable, that we had to eliminate it.
We’re now looking into Office 365 and OneDrive or Sharepoint (as our current OneDrive data is hosted in Canada, which provides huge comfort).