Just bought a Cayenne Turbo S with 50k miles. How reliable have these cars been? Should I buy a warranty and if so who has been happy with theirs. When your their buying the car they push you on a warranty so quick and the brochure they give you says so little about what is really covered it makes it difficult to take them seriously. They were asking for 3,500 for 3 years and an additonal 50,000 miles bumper to bumper (though they don't tell you what is excluded)

What have you had success or problems with?