Lightening fast delivery from Tony at @TokushuKnife.
Only had a few moments with the stone but this thing is a trip! Obviously the construction is unlike anything else. It's very light and you don't get stiction but it may also just be a clever way to use minimal diamond abrasive.
I've already done a bunch of work on this knife so there isn't much heavy lifting to do so that means it'll be a while before I really put it through its paces but I can say that I don't hate the feel, it doesn't feel like it is several grits finer than the stated grit and I like the initial scratch pattern.
Now, that is after all of maybe five minutes so that opinion may well change, especially when I do some real work with it, but right now, I don't hate or regret it.