I recently did the starter tour.
Had a pretty funny german speaking guide who probably lost all his wit for someone who just understands the basics.
He did cover some basics about the airport and certain plane types we stopped next to, but he was more about telling funny anecdotes.
As mentioned above, the tour is basically riding around the apron in a regular airport bus and stopping next to interesting planes/views.
You don't really see more than on a ride from a bus gate - you just have more time.
I'd say go for it if you like the athmosphere but don't expect any look behind the scenes, since the starter tour is really only a quick overview.