I used this product immediately after sharpening using theLansky Deluxe 5-Stone Sharpening System. The knife was slightly sharper, but I mainly noticed a cosmetic difference. I tried using the tool as is, as well as with jewelers rouge as recommended. The jewelers rouge clumped up and made the tool difficult to use, and is hard to remove once applied, so I would recommend not using it. Overall this did work, however I am not sure it is required for a razor sharp blade, so I wouldn't buy again.
Rating: [3 of 5 Stars!]