I am familiar with th Ninja name/brand but I have never used their cutlery or sharpener. I can honestly say that this is the easiest sharpener to use. I have a healthy respect for something that can get a knife so freaking sharp! WOW is an understatement. The precision that the sharpening stone has on the knife is something I never expected. I was like ok it sharpened it, but..NO..IT SHARPENED IT!! Was amazed at how sharp this knife came out. I love that the knife locks into place holding the knife secure. Grip the sharpener at the bottom as indicated and sharpen away. It is that easy. Easy, peasy, lemon squeasy ! Get yourself one.