As I can see, a lot of people rate it badly. I've had this stone for years and use it to sharpen my knives (Japanese or otherwise) and it works great. It's not easy to use, and unless you take the time methodically, you'll find it easier to take your knives to the butcher for use. But I received the stone pictured in the link.
Lansky 2D2C Diamond Ceramic Four: Ultimate Sharpening Solution for Precision
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