German engineering is the best in the world. Rest assured the car will be 100% mechnically reliable. But...considering that most of the technology in the car is now computer software driven....just remember these are the guys that released the iDrive.
Sure over the years its working better, but my last two M5's where complete nightmares when dealing with the sound system or navigation.....mechnically pure perfection, but those Germans just haven't figured out the software side of things yet. I would give them a year or two to do some software patches first.
This might shed some light on the problem: