I'm a sheep farmer, and I am constantly using a pocketknife that has to be sharp. Then when I trim the sheeps' feet, I need to keep the hoof nippers sharp. This little tool is so easy to use and so effective that when I have lost one I can't go a week without buying another. I keep one in the kitchen for knives because I hate dull knives. My only complaint is that it doesn't really stand out in color so if it is in a toolbox or drawer it's hard to spot. I think it'd be even better if the non-working end were a bright color.