Instruct: Classify Amazon reviews into positive or negative sentiment
Query: You won't want this scratching your Global knife after using a waterstone

I bought this product based on the other customer recommendations. It really is an amazing steel, but if you already have a very fine Japanese waterstone (mine is 6000 grit) that gives your Global knives a mirror-like razor-blade edge (MUCH sharper than they come from the factory), you're not going to like the way the diamonds on this steel scratch that finish. Also, you lose some sharpness. After using a 6000-grit waterstone I can literally and easily shave with my Global knives, but not so after "honing" them afterwards with this sharpening steel.Otherwise, it works wonders on my other non-Global knives...