I've been to it, it's awesome!
5 days in classroom training with servers and VTL's to play with. (There is a virtual classroom option too)
The best part, the part I liked the most, was the material they give you. Those books are invaluable.
It covers concepts, installation, configuration, and basic troubleshooting. Not only for BackupExec, but DLO, CPS, and setting up GRT.