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.
External design... wasn't sure at first, but has really grown on me. Handling is outstanding. Top operates very quickly.
Ditch the runflats unless can establish better local availability and more reasonable price. I'm sorry, $500 a tire is out of control.
† Edmunds.com received the highest numerical score in the proprietary J.D. Power 2014 Third-Party Automotive Website Evaluation Study℠. Results based on responses from 3,381 responses, measuring 14 companies and measures third-party automotive website usefulness among new and used vehicle shoppers. Proprietary study results are based on experiences and perceptions of owners surveyed from January 2014. Your experiences may vary. Visit jdpower.com.