Cars.com’s Kelsey Mays took some time at the 2009 Detroit auto show to check out BMW’s new Z4. The ’09 Z4 comes loaded with new features, like BMW’s next generation of iDrive and a retractable hardtop roof that does its business in less than 20 seconds. Mays also finds plenty of reasons to be impressed with the Z4 other than new gadgets. Watch the video to find out why else the Z4 is a must-drive roadster.