I bought one of those and they are pretty good once you lapp them. They are more of a grey/black color. The only drawback was the one I received had wet saw marks about 2/16th inches deep. I had to lap it on some coarse dmt's, so it was time consuming and if its from the same seller he doesn't lap them. You get the stone and a slurry stone. But for the price their work giving them a try.
Actually he sells the cheaper ones unlapped. The more expensive ones he sells are lapped flat, you can find out in the sellers product info below.