Ditto to the above posts. I recently sharpened D2 for the first time (Brous SS), and I found it slow going on my Edge Pro with the standard water stones. I wanted to go to a bit lower angle, and while I could see that the water stones were cutting, it was just taking a while. I switched over to the fine diamond plate, and things went much easier. I then switched back to a water stone (600 grit) for the final finish. I also wanted to micro bevel on the Sharpmaker after this, and I noticed that that too took a bit longer than with other steels I'm used to (things like AUS-8, 4116, 8Cr13-14, 12C27, 440C, CPM154, various carbons, etc.), but I did get there. :thumbup: