Just an update on my Z4 as I've had it almost a year now. About to hit 17,600 miles now and going stronger than ever!
Things that have happened to it so far:
I had a fault that caused the car to go into limp home mode (a common one apparently. Fuel pump I think) after only 2 days of ownership! Sorted by dealer, no further problems.
Had a new roof boot tray under warranty because it split apart on one edge. Probably someone being heavy handed at the dealers!
New rear tyres at around 12-13,000 miles. Fronts still good.
1 litre of oil added around 14,000 (computer indicator advice) hasn't used any since.
A few little stone chips on the front, bonnet and side skirts now. Not really noticeable but will get them sorted at some point (if I can be bothered!).
So far so good. Very happy with it still.