I ended up buying the Norton lapping stone because I had the problem of pieces of grit from the wet/dry paper getting embedded in the hone because it is so porous. Keep in mind that the lapping stone itself also needs to be lapped occasionally. For this reason, many people use a DMT to lap their Nortons. Also, the Norton stone cannot be used to lap natural stones, like the coticule, but natural stones do not have the same problem of picking up grit from the wet/dry paper. I once used the Norton lapping stone to lap a coticule that was very dished. It ended up in a tie: while it did remove a lot of coticule, the lapping stone itself got dished so I ended finishing lapping the coticule on the wet/dry paper and then lapping the Norton stone, too.Just get the norton lapping stone its $25