Never owned an SUV. Test drove many (X5,Range Rover, ML 350, Tahoe, Lexus) including the Cayenne and Cayenne S. The Porsche outperformed them all. Once you drive the S, the power, the energy was incredible. The base Cayenne was a nice drive, however, if you have the extra $15K go for the S - you will not be sorry. The S has incredible power and performance. Its like a jumbo jet racing down the runway, totally awesome. Very comfortable, sporty and drives much nicer than my 2001 C320 Benz that I traded in. No comparison. I highly recommend the Cayenne S.
Favorite features - performance, power, comfort, styling.
Gas mileage is not the best. I knew that going from a sedan to SUV mileage would be a challenge - but the S is worth every penny.