rsync/sitecopy is nice in that it uses file times and even hashes/checksums to see if a file needs to be uploaded. Which is good for slow links, or when uploading files counts against your bandwidth limits.
When I used sitecopy before, and rsync now, it's nice to run one command that selectively updates all modified files.
Additionally, rsync will work over an ssh connection, so it inherits all of ssh's encryption and authentication benefits. Not so with sitecopy and other FTP based synchronizing tools.
That being said, I'll be comfortable enough using sitecopy on TCH.
rsync does have a daemon that does not require ssh or even shell access. Perhaps something nice for TCH to consider running in the future.
Thanks,
Daniel