On 07 models. Last check on dealerworld showed 0 within 150 miles of my store in Metro Detroit.The Aura has 0% for 60months according to http://www.edmunds.com/incentives/R...&tid=edmunds.n.incentivesindex.incentives.1.1.*
Aura is a better deal but the Malibu looks better on the outside.
Looks are subjective.
From what I understand they are mechanically identical and that includes sound insulation. however, they softened or de-tuned the suspension on the Malibu and dialed in more weight to the steering. The Aura definitely has a sportier ride whereas the Malibu is more of a sedate family car yet still pulls no punches.
Other than that there is no difference.