Added: 19th of November 2013
I've had the Cayenne for 10 months and have thoroughly enjoyed driving it, having changed from a Boxster. The driving position is great and the handling excellent for such a big car. It beats the Boxster hands down for practicality but isn't quite so much fun. The running costs are high, 26 mpg on average, but so is the pleasure of driving the car. Having looked at most other 4x4's before making the purchase I can confidently say that I didn't want anything else, except maybe the new Macan when it arrives!
Added: 11th of October 2013
A simply great car. It's fun to drive and goes far better than a car that size could ever be expected. The fuel economy isn't great at around 27 mpg on average, but the fun factor compensates admirably. The running costs are high and official dealership servicing is more expensive than it should be, which takes the edge off ownership.