Stones from Tsukiji Masamoto?

while mining the Web, I came across a vid, where the ceo? of Masamoto was demoing stones.
Basically claiming they were the best thing since sliced bread. The 240 & the 1K caught my eye.
But after much digging, I'm believing they are just a Sun Tiger 240 & a King jumbo 1K
from Matsunaga, but with a pretty hefty mark-up in price. Any one with first have experience
with these out there who can confirm this or give performance reviews

Link to demo:
http://www.youtube.com/watch?v=giq9toMRBhE

Here is a more recent pic of Mr. Hirano. I think the video is a few years old. I used the stones in store and I have one. They aren't miracle stones. Pretty average but it cuts ok on both carbon and stainless. Haven't used it with tool steels though.

http://i1367.photobucket.com/albums/r791/Nqjudo/MM/4U9A7572_zpsd878d4f9.jpg

thanks for sharing the video. it was very cool to watch an old master at his craft. I would really like to get a hold of a 240 grit brick of that size. I could only imagine how long it would last. it seems like it was waaaayyyy too hard to be a 240 which really makes me excited about it.

Thanks again!

You have to be careful, I've found sites listing different stones as Sun Tiger 240. To the best of my knowledge, the beast in question
is GC Angle Cutlery Asahi tiger Mark 16 { Google translation }

it has a bigger brother: GC Angle Cutlery Asahi tiger Mark Over sized Type

link to Google translated page.
http://translate.google.com/transla...27&rls=org.mozilla:en-US:official&channel=rcs