Last night on the The History Channel Bill Goldberg tested the W220 S600 Armored vehicle. He even showed the manufacturer process of the driving fotress.
All body panel are fill to protect the interior. The windows has 4 layer and includes a sort of heavy duty plastic. The tires are the new runflat which can reach up to 50 mph when its flat.
Bill tested the S-Class with a 30 to 45 caliber magnum and glock. Then he sused and riffle which SWAT teams are using. At the end he used a AK47. None of these could not penetrate the car. His final test was to blow up the S-Class with a bomb. The S-Class was still there.
The perfomance. The S-Class has over 520 Hp and can reach 60 mph a little over 6.0 sec. Since this car has over 1000 lbs of armored products, you will feel the weight when turning the car. Overall the car is sound proof.