Dave 
2004 BMW Z4 Convertible 3.0i 2dr Roadster (3.0L 6cyl 6M)
Great Summer fun
 Really have enjoyed the Z4. Lightweight but feels rock solid on the road.  Outstanding handling, steering feedback.  Acceleration is very good, though of course I always want more.  Very firm ride, can border on jarring on bad roads, but much better than M3 convertible.  Actually very comfortable for distances on reasonable smooth roads.  Only significant complaint pertains to most of BMW lineup: runflat tires.  They are more firm, don't help performance, are stocked by very few local shops, and are VERY expensive.  Cheapest local quote: >$1,000 for 2 tires w/ installation.  Ordered from Tirerack.com but even then was >$700 w/ installation.  Not great given many folks had treadlife issues.