Just home after 1,000 km plus across Germany and used cycle.travel all the way ! 

My first long term exposure to German/Dutch/Belgian cycle paths and looking forward to more. I spent a bit of time looking at the Route Guides section then settled on :

Generally D10  'ish from Berlin towards Hamburg

                D7/E3 Bremen - Maastricht

                F4 etc Maastricht - Dunkirk

Faultless mapping when needed on the fly through Garmin Connect, and the "stay" function was useful (even if the sites were closed it was often a first step towards the kindness of strangers)

Keep enjoying the coffee !