The car is a soft spoken beast. You can cruise in 5th/6th gear at 40mph and have no problem or you can take it to 100mph in 4th gear with ease. It is like driving a Viper with 4 drs, lots of room & a real trunk. You seldom see M5s on the road although you see lots of 5 series cars. It gets looks & comments yet looks so normal and functions like a normal sedan. Great pricing on them now too. Get a used M5 for what a G35 costs new and you don't see yourself all up & down the road. When new it was the fastest 4 door car on the planet & will be the 2nd or 3rd fastest for a long time to come. The stock sound system is just awesome.
Smooth, smooth power, great suspension, great brakes and luxury comforts all over.
Just make the cup holders out of metal instead of plastic.