One look at Mercedes' 2010 sales numbers is all you need to understand the R-Class' niche status. In a year when the automaker's midsize M-Class and full-size GL-Class SUVs sold around 30,000 and 20,000 copies, respectively, approximately 3,000 R-Class models left the lot. It's a stark example of the SUV's staying power in the U.S. market.

That said, if you're considering a luxury SUV but might be willing to step outside the SUV box, you'll probably find more to like in the R-Class than you think. It's an eminently sensible SUV alternative — especially if you never venture off-road.