Support BladeForums! Paid memberships don't see ads! For years I have used the basic Lansky 5-stone sharpener with the addition of the sapphire stone and DMT 3-tube diamond pastes for stropping, for my folding knives. And I can always got them hair popping although for some steels it took hours to get there. The spyderco Delica ZDP-189 however seemed to need even more time to sharpen. Out of frustration I bought the 120 grit and 280 grit diamonds to try out and boy are they fast and effective. On this particular knife, I'd say the diamonds work at least 10 times faster to get where I want than the base stones (granted they are a bit old and worn). I plan to buy also the 600 grit diamond. These three plus the 1000 grit and 2000 grit ceramic stones should be a good to handle any super steels I assume.