Ideally, you will want to use FacetWP when you have categorized products for sale — for example, in this case, cars, that come in all sorts of shapes and sizes — or should we say, brands, colors, wheel drives, etc. FacetWP does require quite a bit of configuration, but is well-worth it where it is merited. To use a module like this, it is recommend you have at least 12 to 16 items, each of which can be categorized in at least 2 different ways. For example, color, make, model, year. Or, if you were categorizing birds, for example, habitat, size, prey, location, and so forth. FacetWP is an advanced tool, and great for showcasing.