I chose this vehicle over the Lexus, Mercedes, and Audi as it has a more agressive stance and looks very masculine as well as refined(the Audi and Mercedes run a close second).
The powertrain feels very competent as well as responsive. The engine is competent and transitions very well when challenged on hills and any incline. Acceleration for the 6 is about normal in response time as it is truly pushing a lot of weight.
This vehicle is extremely responsive in the city and feels great while crusing on the HWY. I will add (I do not have a heavy foot) that my gas milliage is excellent for a vehicle of this caliber (20 City / 25 Hwy).
The overall quality is great. Everything is in place, is well finished, and fits. Also, everything works as advertised. I read a few complaints concerning the iDrive but after an hour or so of instruction, it is easily mastered.