The service provided by the gray line tour company was very good! Anyway, in my view the pearl of the tour is the Neuschwanstein castle! Instead of spending 1 hour having lunch, I strongly recommend you to go the bridge in the mountains to take panoramic pictures of this castle.
The best way to know almost all the city centre of Munich in 4 hours. The english speaking guide is very friendly and tells you the history of the city in a very amusing manner. Besides, driving the segways is a wonderful experience!