No fancy polishing, no glossy enamel, no brittle ceramic or cf, just really well put together fit for purpose watches. There are a lot of German brands in that space like Damasko but IMHO when you actually get them in hand and can see and feel the weight and precision of assembly the Sinn U and EZM series watches are a cut above similar competing brands and even other lines within the Sinn catalog.
I haven't seen the U50 yet but I was happy with the size of the larger U1. My favorite was the now discontinued U1000, that was a beast but I loved the spring locked bezel and the yuuuge chrono pushers. I almost pulled the trigger, the diameter was manageable but it was silly tall.
