I purchased an Acrtic White GL320 on 10/31/07. I love the vehicle and overall the fuel economy of the diesel is meeting my expectations. Now that I own both the MB and an '08 Enclave I can honestly say that GM has a winner on its hands. The MB certainly has some enticing things including the diesel offering, a firmer ride, etc. But dollar for dollar the Buick is pretty hard to beat. If they would simply upgrade the quality of some of their plastics and the fuel economy, I would be hard pressed to choose one over the other.
Diesel fuel economy, iPod integration, space, and comfort.
Add-ons are ridciculously priced. $420 for bluetooth? Its free in a Toyota, Acura, etc at half the price. No rear A/C in a $63k truck?