After years of using Michelin Latitude Diamaris 275.40.20....I decided to give the P-Zero an honest try. Once warmed-up, the Pirelli grips like Jelly on a blanket, in the dry. Wet handling is very good, for a tire designed to handle much lighter supercars. In fact, it has slightly better, high-speed cornering traction than the Michelins. It does understeer a bit on very hard cornering - but not at all bad for a sports car Summer tire.
For a vehicle of the Porsche Cayenne S weight(5200lbs+) ...the Pirelli P-Zero RSC(run-flat) offers performance equal or greater than:
~ Bridgestone Dueler HP 275.40.20
~ Michelin Latitude Sport 275.40.20
~ Toyo Proxes S/T 275.40.20
~ Vredestein Sessanta Ultrac 275.40 20
~ Goodyear Eagle F1 Asymmetric2 275.40.20
Great performing, wet/dry tire, regardless of the high wear rate and cost. Since they are no longer produced - I now buy used take-offs, with minimum 6/32 tread remaining for under $200/set. I replace them annually, and can get 8-10k/miles, for a fraction of paying the $1600+ full retail price. I have considered other brands - but simply cannot deny Michelin's safety history....especially driving a 5000lb Porsche SUV.