I went ahead and took the plunge, bought it from Freddytel on Ebay.de. No firmware update, but the phone has no problems whatsoever which is a relief as it seems to be a lottery with this phone
Pics below taken today of the metal black E50, side by side with a silver/white version.
I think the silver white is a beautiful phone and looks slighly classier in a business context, but the metal black is nice too. However the silver/white version IMO looks horrible with the pearl black theme, whereas the metal black one can actually pull it off.
One loss vs the silver/white and silver/black versions is that the metal black does not have blue blacklighting on the keys and the surround of the joystick is striped black with white backlighting, so the effect there is not as cool as the blue backlighting on the other versions.
That said, I find the white backligting on the metal black version to be easier to read so maybe it is more practical.