i am trying it now... they changed the catalog naming scheme a little bit from the last time.
i was thinking i just needed to add "mavericks-" into the URL but this time around it is adding "10.9-" into the name.
learned that from this 'reposado' (open source SUS) page : https://github.com/wdas/reposado/blob/master/docs/client_configuration.txt
it successfully checked for updates and appears to be downloading them now. have not used to actually update a client yet though.