With 330 horsepower on tap, countless safety and control features behind the scenes, contemporary styling, and a focus on satisfying the true driving enthusiast, the 2006 BMW Z4 M Roadster promises to be a real treat for those who enjoy clipping apexes on twisty mountain roads. However, in the area of value the M Roadster faces fierce competition with the 400-horsepower Chevy Corvette, and in the not-too-distant future, the Ford Mustang Shelby GT500 Convertible. Both are remarkable cars, yet, admittedly, neither bear the enviable BMW badge, and that fact alone may sway numerous buyers to the drop-top Bimmer.