I quite like the edge off it...but I don't think mine is a 12K. I'm using it after my Dragon slate hone, which polishes suprisingly fast from 1K, to a hazy slightly scratchy finish. The Chinese stone seems to take the bevel to an even scratch free hazy finish. Then takes a little while to feel the benefit on the edge. But its nice when it gets there. I cant seem to set a micro bevel on it though, which the slate and slurry seems great at.
I know they are not used much for kitchen knives but I quite like these hard stones, they do give feedback, you just have to slow down a bit. So i'm quite happy with my cheap top end stones for the time being. But i'm going to invest in a decent bevel setter with a bit more cut which does not require flatting every time I use it.