After having numerous BMWs from different segments (3, 5 series) I decided to move up to the flagship: the 7 series. I should have realized before buying the car that there would be problems. The engine was just replaced by BMW b/c of a recall. I bought it with 36,000 miles and a warranty on the engine. However, 3 months after having the car the transmission failed! It costs me $5,000 for a rebuilt tranny and another $1200 to install it. The car was an electrical nightmare! I spent over $1,000 in just the electrical failures (windows, moonroof, seats switches) Although, it was fun to drive the costs of maintenance is not worth it. Stick with the 3 and 5 series!
The large body style, comfort, sound system, large rear seats.
I would suggest improvements in the engine, transmission, and eletrical since this series is notorious for these costly problems!