These are interesting, and I like them, but I am not ready to vouch for them because I have no experience of playing with them properly yet. The design is known as die Originalbügelkupplung and the ones depicted are cast nickel silver. At the moment I am fitting the cheaper lasercut plastic cooking variety (available from h0fine.de) to a motley collection of goods wagons and will then be looking for a chance to try them out in service. Both types are hand assembled.
Thing is, the designer intends them to be so closely coupled that sprung buffers are essential. On straight track I have already discovered that this means wagons bouncing away rather than coupling up. They are mounted through the headstock so you can choose to be leave the shank projecting a bit further to be more accommodating, and perhaps avoid the need to have sprung buffers. Bufferlocking is also a potential problem.
NB the V60 is not three rail!
I would prefer to use a magnet than an uncoupling ramp but I cannot see a way to do this. The hoop Bügel (bow or hoop) is made of steel wire and easy to lift from above with a magnet, which I am sure is what the designer originally intended.
Perhaps for most they are just a curiosity. But visually they are a real step forward from NEMs (to which they very happily couple by the way). They are exceptionally unobtrusive.
Edit for translation error: _Bügel_ is 'hanger' not 'bow' or 'hoop'.