Most knife sharpeners that I seen when browsing had 1 or 2 slots in this price range. This has 3 and it comes with a bonus slot. You are essentially getting 2 for the price of 1. Since I grab a knife to open my delivery boxes and envelopes it can get dull very quickly. This little gem sharpened it right up with barely any effort. It is so easy and comfortable to use and has a non slip backing for safety. You really can use this with many different sizes of knifes and scissors. I’ve sharpened every one that I own and this sharpener is still like new. My husband was a naysayer thinking at this price this sharpener would be junk, he has admitted it’s a great sharpener and that I made a good choice.