That is an ultra rare find. Keeping up with the maintenance for a V12 on a Mercedes Benz can be horrendous but when the car is running properly it is amazing. If I was in your position I would buy it but only if there are not major problems ready to surface. Just changing spark plugs and coils on the car will be outrageous in price. 2 plugs per cylinder and 12 cylinders can add up quickly. Not to mention all the additional options on the car that can go bad. If you do buy it, I would recommend a full scale maintenance job to prevent problems. Replace the airmatic relay, flush and change the brake fluid, change the brake pads and rotors if needed, change the power steering fluid and add lexzoil if the steering is noisy, change the spark plugs and coils, change the oil and oil filter, flush and change the transmission fluid as well as the O rings for the plug, change the transmission fluid filter, change the fuel filter and run some sea foam through the car, check all the fuses and make sure none are missing, blown, or misplaced, change the serpentine belt and pulley, change the engine air intake filters, change the cabin filters, change the charcoal filters, change the wipers if needed, check and clear all the drains under the hood, check the moonroof drains, check the COMAND to make sure the boot loader is good, replace the top seals of the airmatic struts using the MB repair kit and the special tools, make sure the tires on the car are of the proper speed rating, and make sure all the soft close doors work and if not determine if its the pump or actuator(s), grease your moonroof rails, check the ball joints. There might be a few things I am forgetting but if you follow those the car should be in good health but you never know what can sprout up. The multifunction display will probably go bad if it hasn't been replaced yet.