Hey, if anyone has experience with Karasu and Renga Suita Nakayama's can they comment on the quality vs. the yellow ones (typically very fine)?

Karasu and Renga Suita are teh most covetted I've found, but I think the Renga Suita is just for the pattern. I BELIEVE from what I've had translated that the Karasu stones are high class finishers, but I don't wanna drop a **** ton on a stone that is rougher than my current J-Nat. I have found a reasonably priced Karasu that I am looking into, so that is my main interest.

THANKS!

O_S and So and the other j-nat junkies please please help me out!