I bought the 100 and 8000 from Marc Kerschner in the classifieds. After using oil stones all my life, I really enjoyed using these. Although these stones are wider than my HF diamond stones, I used the 260 to flatten them when I was done sharpening a couple of things. I think they worked perfect and I see no reason to purchase the big 10" diamond stone for flattening. So far at least. Now I'm on the lookout for a used 5000 to complete my set.