Great suggestion!
Not merely microphones though, but also privacy at a whole.
The other reason is the WWII history.
Das Leben der Anderen is a very good movie with a sublime cast (including Sebastian Koch), but hardly entertaining. A somewhat entertaining movie about the GDR (DDR) is Goodbye Lenin [1], starring Daniel Brühl (Bruehl). Both movies are primary dramatic though.
I can also recommend any movie starring Jürgen Vogel [2] (Juergen). The subjects movies he's in touches upon are often thought-provoking. Although also, usually drama. I can highly recommend German cinema, I hold the authenticity of German cinema in high regard.