Reviews: * Any luxury SUV can promise a quiet cabin and a smooth ride. But very few can claim a 174-mph top speed on the German autobahns or offer the stump-pulling torque of a fuel-efficient diesel engine. The well-regarded safety features of the M-Class are just another selling point, as is its 7,200-pound tow rating. Source: KBB.com * Engine choices include gas and diesel; comfortable seating; high-quality interior and construction; excellent braking distances. Source: Edmunds