I purchased a used but untitled Porsche Cayenne Turbo about 8 months ago. I have put approximately 10,000 miles on it (it previously had 5,000). It has had absolutely no problems. Its acceleration and handling are on par with most sport cars. Its off-road handling is also excellent. The adjustable ride height is a must if you plan to do any significant off-road driving. However, this option also improves daily driving, allowing you to set a fairly low, more car-like ride height.
The acceleration, handling, and build quality.
The turbo lag can be annoying...sometimes pauses from a stop. The keyfob needs separate buttons for locking and unlocking the vehicle. Compared to other new cars I own, the navigation system needs to be significantly updated, probably new software could solve this problem.