Nicolas, you can attest to my UN passion. I really love these guys.
I don't fully agree that that current lack of excitement and appeal is all related to the losses of Rolf and Ludwig. They still have fantastic mechanisms and ingenuity. But the overall designs and details... lots of problems to my eyes. Rectangles and Xs everywhere, too many integrated lug cases, almost all Roman numerals - it is dated and boring. I would argue the Freak version I bought is the last great piece they have released (and I'll be honest - nothing earth shattering about it ((I mean it is a Freak, that IS earth shattering!!)), but otherwise just a nicely updated version of a Cruiser made more accessible to guys like me).
The Sonata is a great example - from the original release on, the "design" or evolution of the watch mostly became more unappealing each time they "updated" it. Some of them are really a disaster.
Ulysse Nardin needs a new lead designer. They have a great core of movements and all the tools in the toolbox. But my goodness, time for some new talent to grab a sketchpad and pencil and get to work.