I bought mine from Knifeworks
. They have the new ceramic as mentioned in the DC4 thread
. I am waiting for a comment on why the change or what the difference is. Initially it seems a bit coarse, but that may change with time. The instructions imply that it will, but are not very specific as to whether the comment applies to the diamond, ceramic, or both sides. I have only used it to sharpen the tip of a knife, so I cannot really evaluate it yet.