Mirrorlink works fine in my car. The main problem is,Mirrorlink is a failed and completely useless technology. Only certified apps work with Mirrorlink :
http://www.mirrorlink.com/appsFor an app to be certified it has to be non distracting and approved by the car connectivity consortium.
Download a certified app such as rockscout and you should see it on your car's head unit. If you don't, visit your dealer and ask for your head unit firmware to be updated.
Mirrorlink works fine with the z3 and my Peugeot 108 and also on the Toyota aygo.