I replaced my 1er with a 2010 S4 and like it quite a bit. It's phantom black pearl with magma (red) leather interior with the ADS, Sport Diff, carbon interior, MMI, and B&O. My biggest gripe is with the MMI. I know yours is heavily revised but the 2010 system is shit. Sat reception blows and the system is really slow and much less intuitive compared to the iDrive. That aside, the car is really well done. I'm very impressed with the power delivery and the ADS is a great feature to have when you mix twisty roads and a bumpy commute.
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2010 S4 Current | 2010 BMW 135i Retired | 2006 Lotus Exige Retired