I got my 2010 Cayenne GTS about 2 months ago and just crossed 1,000 miles. Some thoughts on it. I got it specifically to take the place of a BMW coupe and Tundra pick-up.
First, in my experience, no other vehicles checks as many boxes as this truck. It's very fast, handles amazingly well, luxurious, comfortable and can tow 6200 lb of steel and trailer without drama. See below.
The truck has far exceeded any expectation I had before looking at them and reading up. What vehicle can you drive fast, corner hard in luxury and then tow up to 7700 lb?
The good and the bad
The Good
There is no one best part of this GTS. It's easy to say the engine, but then there are the brakes, also the seats (they are that good), but the air suspension is beyond superb. I find myself anticipating exit ramps just to see how fast I can go through the curves. I'm not sure if Porsche geared the GTS differently than the S or mapped it differently, but it's very different. Definitely race truck. Kickdown and acceleration are addictive. Brakes are standard Porsche Hand of God +1. I had the opportunity to appreciate them today with a fully loaded trailer but in general, excellent stopping power without any drama. And then there are the Alcantera seats which I think are only found on the GTS. If you have a Turbo or S or V6, it would be worth it, IMHO, to find a used pair of these seats and install them.
There are a lot of neat little things, heated steering wheel, lights that turn on in the direction you are going when maneuvering at low speed, auto tilt wheel and seat, etc.
The Bad
Bose Surround Sound stereo. Worst high end factory sound system I've ever heard. I plan on sinking a lot of money into fixing it someday. My 07 328i had a significantly better stereo system. The Bose sounds like a really nice clock radio.
Horn. Pretty sure a 1973 Honda CVCC had a better horn. Putting 80s 911 horns into as soon as I can.
Touchscreen. Takes your eyes off the road. Pretty lame in general. Replacing it as part of the stereo upgrade someday.
So far I've been fixing niggly little things, hoping to replace the K&N air filters with Mann this weekend. Brakes are too good to replace now but looking forward to doing those. Started to replate hardware I've take off the engine tray while cleaning those up.
I'm sure there's other stuff but really it's just a joy to drive (which I never could have imagined) and hard to keep your right foot out of the pedal. Today I had to pick up steel to build a paint shop. 2200 lb trailer, 4000 lbs of steel. Truck handled it with ease though when someone stopped short to make a left turn, the 3 cars in front of me slammed on their brakes, as did I, amazing absolutely no drama. Fantastic brakes.