The prototype on display at SIHH was not functioning properly when I visited the Montblanc salon. Apparently there was need for further fine tuning, but it wasn't clear to me if that meant this example or the overall design. It is a very complex and delicate timepiece, novel in appearance, but I found it very difficult to use. This is one "halo piece" that may be more at home in a display cabinet rather than on the wrist. Certainly an object of horological admiration and perhaps practicality is irrelevant as MB pushes the boundaries.