dazeahead 
2007 BMW 6 Series Convertible 650i 2dr Convertible (4.8L 8cyl 6M)
Previous Porsche owner's observations
 Unmistakable German engineering.  Handling excellent for a car this size, but not as easy to corner aggressively as with a 911 and its "oversteer" which makes any turn at any speed effortless. This is more a touring car and less a sports car. Very comfortable and manageable interior.  The iDrive is very easy to learn and use.  Sport package, comfort access and heads-up (I do not have HUD) a must. You can't see the speedometer or tach when cornering which is a distraction when pressing the car around turns.  Overall a very impressive and formidable automobile.  Not quite the Ultimate Driving Machine, but an excellent stand-in.  A 911 is a 911, period.