After seeing that Bill has had the Duesenberg vibrato arm fitted to his guitars, I was inspired to try one on one of my own guitars, a Les Paul Studio. I ordered it from a music store in Toronto. I fitted it yesterday. It really is as easy as they say - direct swap for the existing tailpiece.
It feels great so far. The arm length is adjustable so I'm still adjusting to fit me. You can tell it's |German made as it has a solid feel. Here are some before and after pics: