Sorry to hear about all the problems you had with your BMW 7 series.
I too own a BMW, 5 series. It's been really good to me. But I wanted to point out is I love BMW's this is now my 3rd car. I just recently purchase a summer car. My choice was a Z4 or maybe a boxster. Well, the boxster won. I was very dissatisfied with the Z4.
Hats off to Porsche! Excellent car