I use the Sharpmaker system and stones. I have the diamond, medium, fine and extra fine. I tend to use mostly the medium followed by a quick strop on leather. Never found the extra levels of grit worth the time. The edge was just as effective with a quick touch up on the mediums or strop. For serrated our combo blades I prefer the medium finish as it adds to the 'bite' of the serrations in fibrous material. Of course this is all just opinion as I have no empirical testing to back any of it up, just my experiences/observations.