Johnny,
Just checked the site you referenced (Flyingbrick.de). The home page pays respects to the two developers of the bike, speak of it's radical design and go on to say that the lucky owner of a K-bike owns something both modern and classic - it was so far ahead of its time. And it does say it's not perfect. But another tab on the page called "eine Kurve voraus" (a curve ahead) lists deceased owners of the K-bike.... members of the Flyingbrick.de forum. It is a somewhat somber read. Fortunately, most of the deaths are from disease and not accidents...although there are a couple there. The common thread seems to be their passion both for these machines and for motorcycle riding. Many of the departed were my age (56) or younger.
My point? Appreciate what we have today, go for that ride, preserve the bikes for future owners and, for God's sake, be careful out there!
Merry Christmas to bikers everywhere!