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With using a norton 4k/8k and this stone (mentioned above i think) should do the job of sharpening and giving the edge a good finish. Just seems a nice cheap addition.
Some people like to use the ...

They would be approximately the same but would have a different "feel" to the edge.

Here is a link to the Chinese 12K
http://www.woodcraft.com/family.aspx?familyid=4920