My wife drives a 2013 Cayenne. IMO it's enough engine for an SUV, the mix of the instant throttle response of the NA V6 and the aggressive tip-in tuning of the Aisin 8 speed AT make for a car that feel zippy around town. It's equally at home at speed on the hwy and it's very easy to creep above legal speeds if you don't pay attention. It's great for long road trips, the 26 gallon tank is great and you get at least 25 mpg on the hwy. But while it's zippy and happy going fast it's not a good performance driving car, for that you'll want the S or above and PDCC since it does have a bit of body roll when pushed.
As for up keep it's what you expect from Porsche, everything's a bloody rip-off. Service costs are redicolous and so are parts. Reliability has been so-so, we needed a new transfer case ( under warranty luckily... ) and new water pump, after warranty
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We really like it though so all in all we would do it again even if dealing with the dealer is liking eating barb wire due to the costs.
You'll want the upgraded seats, they are super comfy.