The quintessential Mercedes is still a technology-laden luxury sedan. Yes, today the company's three-pointed star adorns a wider variety of vehicles than even Ford's Blue Oval. But that is merely the cost of chasing luxury market share. Mercedes' commitment to its ideal form is so strong that it graces even its most entry-level car, the A-class subcompact, which has grown and grown up. Now offered as a proper three-box design-two more than it started with in 1997-the fourth-generation A-class makes its debut in the U.S. market early next year.