I want to echo the previous post about the virtues of the Vermio hone.

I have a full set of Naniwa new superstones, including the 12K. I rarely use it as I was never able to get a keen, smooth edges for my beard and face. When doing a full sequence honing, I progress up the Naniwa grit levels through the 10K and the move to natural stones. My current finisher of choice is the Greek Vermio. The edges I get using that stone rarely disappoint. I seem to get the best edges using it lubricated with a few drops of gylcerin, liquid hand soap, or shaving cream.