Can't say enough good things about the Santoku Mom bought - and neither can my pet egret. I use it every day to cut up mullet to feed to him - with little effort it cuts cleanly through bone, skin, scales and innards like it was butter.
These are among the finest composite whetstones made, and an excellent value in a very high end stone. They are resin-impregnated so they are very fine and smooth and do NOT require soaking -- just spray/wet and you're good to go. Very easy sharpening, and long-lasting. These stones are great for the pro or serious home use, as they do not have bases and are a full 2cm thick, so they' last for many, many years.