So I have read By-Tor's great reviews of the UPO (45mm) and as well as a few other members reviews of both the PO 42 and 45, really great information. But I am not sure if I am missing something, if please point me it the right direction. Is the 42mm also a "Ultimate" version? As it is called on PT's site, or is this just a name to cash in on the success of the 45 version? Does anyone know what the most noticeable differences are on the latest 42mm version versus the Gen? Again, if I have missed it, my apologies.