I just got mine yesterday, and I opted for the black on dark charcoal gray version. This gives me some options.
1. As it is in low light it looks like a blank black version.
2. When I forget the identify of a key, I can turn up the ambient lights and sneak a peek.
3. I can get complete sets of keycaps specifically for the HHKB Pro 2 in blank white or black or lettered white and light gray.
Although I like the Otaku look of blanks, I tend to prefer highly visible legends, and so I intend to replace the black on dark gray with a set of lettered white and light gray. This gives me the opportunity to showcase one of the great features of this keyboard, which is the beautiful dye-sublimated PBT keycaps -- arguably the nicest keycaps available for any keyboard, including the white/gray RF 87u and the IBM Model M or SSK.
