Originally Posted by
RefGent
I have some experience with the Shun 300x/1k, but not the 6k. It belongs to my work, so I mainly have used it for high end hair scissors and some of the nicer knives that come in for sharpening, but I haven't put a razor to it. I can't speak to the 6k, but the 1k leaves a very nice finish for the grit level and is overall a very high quality stone. I think they are getting an established Japanese stone company to produce them for them, not a Chinese company like a lot of other knife companies do.
If you have a razor other than your designated user that you don't mind making a guinea pig, lap both sides flat and smooth and give it a whirl. Given my experience with the quality of their stones, your main hick ups will probably be general hick ups that most beginners run into, not the quality of the stone.