I have experienced the Acura; very nice, but not in the same league as the BMW. In the 4.8 version with sport package the BMW is light years ahead! By the way, the premium sound with HD is more than adequate. The trendy Acura , in my experience, will be outdated and old news with the next year model. The BMW X5 evolves with every facelift and upgrade. You can only build upon an already superior vehicle. I personally would rather have a CPO 2007 X5 than a new Acura.