Its a gold plated rotor, not solid (?!) That's news to me. Just for the sake of aesthetics I presume...
I rather have a steel rotor with a Pt/Au peripheral mass with gold chatons
Further to add, the font kerning between "S" and the "öhne" on the rotor always bugged me
What I -do- like about the Lange rotors however is how smooth and effortlessly they wind. Or at least, vs the automatics I have (JLC Cal 899, ETA 2824, ...)
Regards,
skyeriding