I’m really impressed with the Ninja Foodi NeverDull Sharpener! I have the Ninja Foodi Chefs knife which is one of the sharpest knives I’ve ever owned. It makes chopping vegetables a breeze but after some time it needs to be sharpened. The Ninja sharpener is simple to use and your knives are as sharp as the day you got them. You simply insert your knife in the slot it locks into place you slide lever up and down ten times press the unlock button pull your knife out and your done. I highly recommend this knife and sharpener.