<< Is it worth it? >>
I would have to go with the universial computer answer... Depends...
If you have a bunch of MP3/JPG/AVI etc.... then no it's pretty much useless....
If you have some network apps you are serving our are storing roaming profiles... then it is actually pretty handy... You can grab back some space from the network install of Office 2000 (the KING of bloat) or from space hogging users...
Drives are cheap... unless you are talking about Compaq (or any other server makers) drives... We pay a pretty penny for drives for the servers at work (of course 10,000 RPM LVD SCSI that's hotswappable is VERY nice)