To say the Porsche Cayenne has been a success would be a massive understatement. Porsche's first SUV, which debuted 15 years ago amid cries of "heresy," has helped the brand immeasurably. For one, it brought a huge number of new buyers into the Porsche orbit, the sorts of people who admired the 911 from afar because they could never shoehorn one into their lifestyle. And with them came a vast infusion of cash that Porsche was able to reinvest in its core sports car products to make them that much more exciting and desirable. Instead of watering the brand down, the Cayenne — and the Macan that came later — have proven to be a potent corporate elixir.