 The 650 has what BMW calls an "inherent characteristic."  If you drive in "manual" shift mode the vehicle is prone to stuttering when coming to a stop.  Imagine your head bobbing back and forth like a doll on the dashboard.  The vehicle is also prone to severe lunges when driving in m1 (such as you might in a parking garage looking for  a spot or while moving forward in a metered freeway on ramp) and to a lesser extent in automatic.  The lunges are dangerous and you must drive defensively at 4 miles per hour.  BMW states the problem is with the  software-it thinks the engine is stalling and the computer gives the engine throttle. BMW won't fix the problem.  Stay away from this vehicle. 