It's simple really. The Prius Chat Shop is the only place that rigorously tests everything they sell. If quality and value are important to you, then there's one place and only one place to go for everything for your Prius. I've known the owner, Danny Cooper, for more than ten years. He's a good friend and a stand up guy. And, he plows the money from the shop back into the best site for Prius discussion, PriusChat. So make your purchase count on every level. Do something for Prius community and get the best accessories available for your Prius.