I got a 3 year/36k mile warranty on my '99, last year when the car was 8 years old. It was just under $3k, and has covered everything. I got it through the dealer, not Porsche.
The only thing it hasn't covered were inevitable repairs. For example my drivers buckle went out, and the mechanic said the other one would be going soon. They won't cover it until it breaks. So if I catch an RMS leak, they won't repair it until the engine dies. Which sucks, but doesn't bother me as long as there paying.
