I just received this stone from Stu (Tools From Japan) and thought I'd make mention of it here. This stone cuts FAST! It even comes with a warning about how much damage it can do...it rips steel away! Doesn't really dish so much but will glaze...in fact it comes with a few bottles of Silicon Carbide (60 and 120 grit) just for cleaning the stone...basically it takes a small bit of maintenance but seems well worth it as long as you keep the stone from glazing...anyway, with shipping from Japan I believe I paid right at $20...and Stu got it to me in about three weeks (pretty remarkable as it was during the Christmas rush and he's notoriously slow to ship). For those who do any significant thinning or just want to knock it out quick this may be something you'd enjoy. I don't believe diamonds could outperform this stone, especially for the cost. FWIW, I will be following this with either a 220 pink brick or 320 cerax depending on which cleans up the scratches better and really wouldn't want to go straight to a 1k'ish from here without at least another stone or some sandpaper to ease the scratching.
Stone not recommended for faint of heart or new sharpeners because it removes so much metal so fast.