I'm in love with my Z4M Roadster! After an opportunity for a full day on track with latest R8 V10+ I was quite sad, thinking I would never be able to buy a car that can truly blow me away. I was wrong and realised it just a month later when I saw the ad for this car. It's not as good a performer on specs as the R8 of course, but driving it feels as good if not better than driving the R8. And I definitely love the S54's sound more than the Audi's V10 however that may sound to someone.
I hope I never have to sell it.
P.S. Installing an ESS VT-525 kit haunts me in my dreams some nights....even though I've never felt lack of performance.