I do not own a Chinese 12k, I started with the spyderco set and frankly, its a little hard to move away from something that works.
That said, the spyderco UF is $40. The Chinese 12k is $30. Come on now...besides from the **** of a time lapping the UF is, the edge is finer and its only $10 more. I don't see the point in the 12k.
Please correct me if I am wrong. I don't own a 12k, I can't see stepping down in grit for a stone that allegedly takes forever to get a polish with.
edti: Plus! You don't have to lap it ever again.