The CLA proves that pedigree does not ensure a refined car. At first the engine feels unresponsive, then the power comes on abruptly. Though the car is agile, the ride is punishingly stiff and the CLA is loud inside. Cabin access is difficult, and the well-appointed interior is cramped. The heavily promoted base price is something of a tease; buyers need to spend a lot on options to get the luxury features expected on a premium model.