I have a thing about knives and sharpeners. I own a few, this one will not reprofile a blade but will harpen a dull one quick. There isn't any art to this device, anyone can use it. you draw the knife through the spring apply tenstion, the sharpener has the right angle. The sharpener edges have a diamond like coating, like diamond files. If you want a quick edge on your kitchen knives this is the item you need.