 This Q45 has received praise from "Car and Driver", "Edmunds" and "Consumer Guide".Low sales are attributed not to the car’s overall quality or performance, but to lack of advertising and the debatable prestige of the Infiniti brand.The 2003 model was given a number of under the skin upgrades including a new security system, a numerically higher final drive ratio (for better acceleration - decreasing highway fuel economy), reprogrammed TCU, and during the year, a satellite radio option.