Did the section from Kaiserslautern to Idar-Oberstein recently, two up on a Fazer 600 S2. Lots of long village sections with 50 kph limits and speed humps. Some of the towns are pretty enough but it's slow progress. Might be alright if you're on a 125 and want to stay off the autobahn. Dull.
Route from Kaiserslautern approximately 240 Kilometres