Five stars for inexpensive and razor-sharp knives. However, I have many complaints. I have a set of Norton combination stones that are exactly the same and sharpen 2-3 times faster with less wear on the stones and the stones are 8" compared to their 7". Norton was really $149 so I still can't complain about these stones. Norton polishes to a high gloss, these don't. But I think mirror finish is overrated. Because of this my guess is that 8000 is more like 2000 and 3000 is more like 1200, 1000 is probably close to 1000 and 400 is more like a seven or 800 and doesn't do any fast work at all. The good thing is that all the stones make the knives razor sharp, which works great. I don't worry about changing stone sands because they all work pretty much the same. But again, I'm happy with the results, it just takes twice as long. If you don't mind spending the extra money, I'd go with the Norton or King 1000 6000 combo stone, which costs less than $50 and is probably the best of the three, but doesn't come with a leveling stone or holder. A damp towel makes a great holder, and there are many ways to flatten stones cheaply. I use a DMT diamond blade, which I also use to sharpen pocket knives and tools. I also used it to smooth the leveling stone that came with this product so I wanted to test yours before using it. By the way, Norton is an American company, but the stones are made in Mexico. Kingstones are made in Japan and of course this product is made in China. I also think all these bamboo backed Chinese stones are identical even if the colors are different as the 3000 page wears out incredibly quickly after reading other reviews. You often see this comment in one star reviews. I would estimate 10 to 15 sharpenings and maybe 30 sharpenings on the 8000 side. At 400/1000 I haven't noticed any wear and have sharpened six knives on each side.
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