The 2009 Acura RDX is acoustically proud of its turbocharging; you'll hear the unmistakable sound of its turbo spooling up as you're pulling out of your parking spot. It's never intrusive, but the sound will serve to remind you why the RSX feels a little non-linear off the line.
The ride quality is very good (especially compared to an X3) at high speeds, but can be a little nervous when trundling around town. That stiffness, however, translates into stable handling and well-controlled body motions.
The RDX's two biggest flaws are to be found in its cabin. A bright and airy place to be, the 2009 Acura RDX's interior is let down by some inexpensive looking (and feeling) materials. The lower door panels, for example, are made from hard and scratchy plastic, and the speaker grilles look like they're from a Fisher-Price toy. The second shortcoming is the navigation system. Though it includes most functions present in modern nav systems, Acura's system is particularly difficult to use. The menus are displayed in a somber, non-contrasting grey, and are easily washed out in the sun.