Cuts very quickly. And I mean extreme. It's faster than my 120 grit waterstone and also does double duty in smoothing my waterstones. I can't comment on durability yet as I've only been using it for a week. When you need to quickly remove deep chips and level stones while it's worth it. Be careful, this is the type of stone that can seriously and quickly ruin a blade if you use it too often. I bet you could turn a chef's knife into a fillet knife with little effort. Quick Tip I've found that less pressure is better. It seems to cut a lot more with moderate fingertip pressure.
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