The renowned Frankfurter Allgemeinen Zeitung, also known as the FAZ, has published a review of volume 24 of the DDS, which covers the years 1967-1969. Its author, Horst Möller, was the Director of the Institute of Contemporary History Munich-Berlin up to 2011, and Professor for Modern and Contemporary History at the Ludwig-Maximilian University of Munich.
"a wealth of views"
At the end of his review from 19 June, Möller states that the volume offers "a wealth of views, not only into the history of Swiss neutrality and its pragmatic foreign policy under changed conditions, but also into essential European and worldwide political developments at the end of the 1960s" (translation from German). The full text can be found here.