I have for a long time the Braun hand blender - now the knives were not as sharp .... and there is a "spare part" I think that's really great. So my immersion blender is complete again ... and the - is real "professional equipment" Even Tim maltster uses it. Prima is just also that the attachment of metal ist..so there is no discoloration - I puree my "wild garlic pesto" with it. It really is a worthwhile purchase!