I the product that was shipped to me was obviously opened previously, as the styrofoam was broken and missing the middle section. I tried to sharpen some knives anyway, and although the stage 1 and stage 2 sharpeners worked well, one side of the stage 3 was somehow off and caused the blade to bounce more than it should. Good results were extremely difficult to attain. I returned the product. Giving it 3 stars since it was possibly a used item and could have had a defect.