Performance is a plus with either model. The Z4 2.5i is no slouch, able to accelerate to 60 mph in 6.8 seconds with a manual transmission. The Z4 3.0i is quicker yet: 5.8 seconds with manual shift. Both manual transmissions are smooth and easy to shift, though some testers would prefer a firmer, more mechanical feel. The automatic transmission is quick to downshift and supplies plenty of passing punch, even in the 2.5i. Some testers have branded the throttle as too sensitive in the Dynamic Driving Control's sport setting. With a manual transmission, test 2.5i models have averaged 20.8 to 25.7 mpg. Test 3.0i models managed 20.9 to 22.9 mpg. Both engines require premium-grade fuel. Ride quality is appropriately firm. Some testers say 18-inch tires in the 3.0i's Sport Package make the ride too jarring on all but smooth pavement. Others have found that the Z4's tail rebounds over dips more than expected. Body rigidity is outstanding for a convertible. Steering/handling is where the Z4 excels: Agile, grippy, and nearly flat in corners, the Z4 defines driving fun. Standard traction/skid control adds a measure of security. Steering is quick, predictable, and nicely weighted, though straightline tracking is compromised by the widest tires following road grooves. Some testers believe the "driving dynamics" sport setting imparts an artificially heavy feel. Braking is short and stable. Wind and road noises are typical of a top-down convertible, but with its top raised, the Z4 2.5i is impressively quiet for a sports car. However, 17- and 18-inch tires can annoy with slap and rumble--especially the 18s. Gauges are well-positioned, but audio-system readouts wash away in direct sunlight and headlamp controls are hidden by the steering wheel. Top-notch interior materials are assembled with care. Aluminum dashboard trim, standard on the 3.0i and optional for the 2.5i, is especially stylish. Spacious for all but the most robust occupants, the Z4 has a steering wheel that tilts and telescopes to benefit driver positioning. Some testers wanted more lower-back support. Top-down visibility is good, except for interference from the roll bars. Like most convertibles, top-up visibility to the rear is poor. A low stance means difficult entry/exit with the top up. For a two-passenger sports car, trunk space isn't bad. It holds several gym duffels or two rolling carry-on bags. BMW says two golf bags fit inside. Interior storage is minimal, however.

Value for the Money
Ranking as a Recommended pick, any Z4 provides an excellent balance of performance, refinement, and driving excitement. Against prime competitors, the 2.5i cost as much when new as a Honda S2000, but is less powerful, while the 3.0i is by any measure a credible alternative to the comparably-priced Porsche Boxster.