The AccuSharp knife sharpener is a fantastic value and does a great job just as described. I saw it on America Test Kitchens as a recommended buy so I took the minimal risk to purchase the sharpener. It's simple to use and the directions are very clear. No guessing on angles in holding the knife or sharpener. I sharpened my favorite knife then used it to chop onions, celery, potatoes and peppers in making soup. The knife made clean cuts without any hand pressure - just guided the knife through the vegetables. Easy to make dice of similar size. If the sharpeners ever become dull, the directions show how to reverse the blades for good-as-new second life.