Terry sent me the AR to play around with last week. This particular stone falls somewhere in the 8-10K grit range and like the AS has very nice feedback. Unlike the AS the slurry stone produced light slurry rather easily and it added marked cutting power and speed to the AR. The resulting edges were keen and smooth but less aggressive than the AS. The AR can be used as a finisher for straight razors and/or a pre-finisher to the AS for added refinement, they are different animals though and work well individually. I was able to achieve HHT4 before stropping easily. As was the case with the AS, I purchased a AR after I returned the test stone and have no affiliation with naturalhones.com