That's a joke right?
VSS is by far the shittiest VCS I've had the displeasure to use, though I will confess I never had to suffer through RCS and CVS.
It's certainly the only one which managed to destroy data. 'twas a good thing I'd already used other source control systems before VSS, because that experience would definitely have made me flee from source control systems for a while (much as Java did static type systems).
There's some good links there that describe the trouble VSS caused.
It haunts my nightmares.
When we were migrating to git, some of the more senior engineers came up with a workflow that was described as "the best implementation of ClearCase in git that I've ever seen". It was meant as a compliment.
We switched to CVS and it was immediately better, followed by SVN a few years later. I still use git like a fancy subversion, just with multiple repositories :-)