The honyama is best finishing stone I have used for carbon steel and super high carbon tool steels. I don't realy care for it's feel or finish on stainless steels like vg10, or what ever Macs are made out of. The edges it produced on carbon are super crisp and extremely aggressive. I love that it also brings out the kasumi haze finish on my traditional Japanese patterned knives. I would really rate this a 4.5.