/prog/ comments on SCCS

I know there are better systems (SVN, Mercurial, GIT, etc), but we are forced to keep Unix source files on Visual Source Safe (yes, my bosses are Microsoft shitheads)

I only have SCCS available on our Solaris machine, without any chance of installing new software.

Being that SCCS is sooo old... it is worth it to learn?

I see this all over.  What exactly do you gain by using one source control system over another?  I've never seen any significant difference in behavior between VSS and SVN for example.