| The Bottom Line | The 2010 BMW Z4 sDrive35i delivers incredible driving performance while incorporating practical cabin gadgets to inform and entertain. | Although not as hard-edged as some sports cars, the 2011 BMW Z4 sDrive35is provides plenty of driving fun and, except for the lack of cargo capacity, makes a fine daily driver. | A fun, luxury roadster, the 2012 Mercedes-Benz SLK350 carries an excellent cabin tech suite and delivers aggressive performance, but those looking for a cruiser might find the SLK350 too much of a beast. | The 2012 Aston Martin V8 Vantage Roadster serves as a fine showpiece, but a balky transmission and poor cabin electronics hurt its everyday drivability. | The 2010 Infiniti G37 Convertible offers an excellent cabin tech package and fun sporting capabilities, but lacks some refinement for everyday driving. |