Well that just depends. I have no experience with plated diamonds on steel, but I do know they are in a league of their own as far as being the most aggressive bond possible. I would think the Atoma would be the pick for serious metal removal but don't quite apex with it. The Venev F150 I would also advise not to apex with as it leaves a honkin big burr, which will take the apex off when you break the burr off. I got ahold of a Maxamet Spyderco from DeadboxHero last Monday and after sharpening it I am feeling a lot better about the Matrix 300. It is not the fastest stone but it will still cut fine using just the weight of the stone and arm. This free cutting action with very little pressure lets it apex with a very small burr for it's grit, using only edge trailing strokes. I am really thinking the Matrix stones niche is their ablility to sharpen a high quality edge. I have a few reviews in the works and will post them when I have time to get them finished.