Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Shun Santoku Sharpening

The many five star reviews with which I concur, justly recognize this superior knife. I just bought a third as a gift for my hosts upon sharing a week at their home. The second was a present to our foodie kids a couple of years ago. The original purchase, was my wife's Christmas gift. After three years it isn't as sharp as a new one. Still it's noticeably better than every other knife around.As woodworker my chisels and planes are nice and sharp. But this knife is something else. The Shun website includes instructions for returning the knife to them in Portland for free sharpening including return shipping. The biggest disadvantage is turn around time without this go to implement, about a month, and one way shipping cost. They offer an electric sharpener. But it's cost is more than half of another knife which I intend to buy before returning our original for them to restore.