I have the purecontacts on my 2009.
I have about 38-40k on them (i have snows for the winter) and they are down to about 4-5/32. Fairly evenly worn as I rotate them every 5k miles. I have a shake from one of the front tires that cannot be balanced out. You can feel the steering
wheel move at slow speeds while turning a city corner. I know it is not a CV Joint or suspension issue because when moving that tire to the rear, the imbalance goes away. Will they last until the 70k they are supposed to? NO. Overall, I like them as they are still fairly quiet but that shake is bothersome. Will I buy them again?
Probably not as I want to try the Pirelli P7 Plus or the new Cooper RS3-G1.
This is just my experience with the purcontacts.
First, I've just accepted that performance on all tires drops off so much after ~35,000 miles that I just get a new set. Usually, Discount Tire will help me out with a manufacturer adjustment or just give me an allowance on a new set, as I buy all my tires for my three cars there. Just the other day, they gave me a $80/tire allowance for my Pirelli Scorpion Verde Plus tires(with 24,000 miles on them) that I got tired of on my 2009 Enclave. Those tires still had 7 to 8/32" left on them, so they couldn't adjust them via Pirelli's policies, so they just "bought" them from me. FWIW, I went back with a set of Bridgestone Dueller 422 Ecopia. Discount Tire offers a 30 Drive Guarantee, so if I'm not satisfied with them, I will swap them out for a set of the Michelin Premier LTX.
Now, I can't speak to the new Cooper, which seems to be too high performance for my tastes, but as to the Pirelli P7 Cinturato Plus, I have a set of them on my 2012
Buick LaCrosse. I will say that Pirelli are a good tire when new, with low noise and decent ride, but there are a couple things about Pirelli that I don't care for, which seem to happen fairly quickly as they wear, which is why I replaced them on my Enclave. First, the rubber seems pretty supple when brand new and give a good ride, but seems be harder down in the tread that is exposed as they wear. Also, the sipes in the tread only extend maybe 3 or 4/32" down into the tread. This means that wet weather performance drops off pretty quickly as they wear.
Michelin is the best in this regard, as their sipes extend very far into the tread depth. Also, the rubber on the Michelin Premier LTX is the best I've seen in terms of its suppleness and traction. You can actually feel how "grippy" it is if you rub your finger across the tread. As I posted above, I now have a set of LTX on my 2012 Genesis 4.6 and I think they are the best tires I've had on the Genesis, including the Pirelli P7 Plus I had on it. Now, with their supple rubber, the LTX are probably not the best choice for longevity, so if that is a top priority, you may want to avoid them. But if ride and noise comfort are high priorities, I don't see how you can beat them.