Got a Z4 loaner today (3.0 auto with sport package) - what a blast! Good engine and great handling. I had gotten so used to my M5 that I forgot what it was like to throw a small light car around. This thing dives into corners and sticks like glue even with a surprisingly compliant ride. Only complaint (other than aesthetics) is the steering feel - rubbery and numb (much more so than my M5).