They are worth it if you are preparing recipes that would call for very fine grating, pulverizing or slicing--because a food processor does all of that--slices, juliennes, pulverizes, blends, mashes, mixes and grates. Of course if you already have tools that do those things, then no, you don't need one--but sometimes it's nice to have one that can do it all in one place. If you decide to get one, get one that comes apart EASILY and is easy to use and clean--that's the worst part about them. They're hard to clean. For making things like icing, hummus, salsa, or anything you need a high-capacity food tool for, they're nice. For smaller batches of things, you can certainly just use your grater, mandolin, and blender and get the same results. It's easier to control the size of the chop, the amount you need and the constency with a food processor--but do NOT buy a cheap one--they're more trouble than they're worth. Small ones are not really worth the money either--if you NEED a food processor, you NEED a full-capacity one--and those may be more trouble than you need to take to do the same functions you can do with your other things.