I have the US Premium, which is unbranded and has 14 speakers. It is excellent . . . for the money of about $1k. It is a must have in this car as the US basic is absolutely horrible. IMHO, it is very bad advice to tell you to stay with the basic and not upgrade, then opt for an aftermarket sound system. That would be incredibly expensive. The Premium is really good and much much better than the upgraded Harmon Kardon system in my X3 35i.
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