We are on our second Cayenne Turbo. First was an 05. We had it 6 years and ran it up to 225,000kms (140K miles). Great vehicle. Replaced a driveshaft bearing and then around 100k miles replaced the suspension bushings. We sold it 4 years ago and we still service it at our shop.
Current one is a 2011 Turbo, we have had it for 4 years and it has about 120,000kms (75K miles). It gets about 50% better mileage than the 05 did. Far better interior layout, amazing seats, is lighter and handles significantly better. Have had no real issues with it. Brakes for this model are expensive though. We have an ecu tune in it and cat delete pipes. It is ridiculously fast. Can break traction with a roll on in second gear. Wife has a heavy right foot so the power gets used.
That said, as much as I love this vehicle, we would probably have a tuned Macan Turbo if we did not have our 2 boxers.
We service quite a few Cayennes from across the model years. The 2011 onward 958 ones certainly seem to have fewer gremlin type issues than what we have seen on the earlier 955 models.
I get asked all the time what I think of it. I tell people that of the 35 or so Porsches I have owned , it is in my top 5 favorites for sure. And those who know me know I am a sports car/race car junkie...
Cheers