Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Easy to Learn

To see the plain knife instructions from the video search for this on YouTube: VWL1UsppIeA I saw warnings about the long complicated instructions for this "sharpening system" that made me leery and I'm very comfortable reading instructions. But don't worry about the learning curve. The length of the instructions is due to the fact that you can sharpen anything with this including nail clippers and potato peelers. For a plain edge knife it's two pages, most of which is pictures. It's a fantastic tool. The video is fabulous but you don't need to watch it to use the sharpener. The entrepreneur behind this gadget is a great teacher. He starts with how our prehistoric ancestors sharpened stone tools. Any cook who knows how to chop should own this - it's as simple slicing an onion - and for anyone into tools you are going to love this thing.