I guess I'm still stuck with rsync and cronjobs until they work out the issues.
It often seems to churn away endlessly shoving meta data back and forth, and has periodically gotten confused about what files have been deleted or moved. Also had an issue where it kept duplicating some files. Toss a directory with a few thousand small files in it and it takes forever to sync. Not particularly light either.
They have a way to go to make it clean and elegant, but being able to seamlessly sync between Mac and Windows machines anywhere, without having to store in their cloud is nice.
Really hope they work it out one day, because I'd love the functionality for keeping dirs in sync w/o having to pay for the cloud portion; but right now its primary use case for me (dealing with dirs larger than I want stored in dropbox) appears to also be its Achilles' heel.