This particular jig lets you taper the legs of anything from small short legs to big ones like 4x4's and also make very wide diagonal cuts on things like sheet stock. It also functions as a straight line rip jig to cut a clean straight rip on a rough edge. Something that a store-bought tapering jig cannot do.
It is a very easy project to make. And one that you can probably build in about an hour. This could save you money on a store bought jig.
It is also designed to be made very inexpensively. If you choose to make the hardwood hold down clamps, and a hardwood strip for the miter bar, you can make this jig for less than ten dollars. If you make it the exact same way that I did mine it will run more, but it makes it even easier to build.
