Although I can not say how long the new Focus remains on a knife and how a knife suffer ..... is probably also from the knife from .... but after a few times by pulling these things are really sharp again. For me it was important that the part is small and fits in my little kitchen somewhere in the closet. The Knife Sharpener WMF build on more clearly.
Summary: It Works, so far no defects found. And therefore recommended.
