US quality? I dunno. My 2003 M5 (German made) is in the shop so often that the mechanic and I have become good friends. The NAV has been replaced 4 times now. You do not buy a BWM for reliability, because it sucks for most part. My m5 is my fun driver (along side my new C6 Vette). My daily driver is a Toyota (Japanese made 4runner).

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2003 BMW M5
2006 C6 Corvette - black on black
2003 4Runner - 3 inch lift - BFGs