Got to say the ACC is a must have option, it just soaks up the speed ramps, esp those sqaure one's in the middle of the road!! Well worth the money IMO!! The RNS510 makes a funny noise when its switched off for some reason very starnge , hope it doesn't drane the battery?? Sounds like a humming nose even when the engine is off and the key out?? Thats gonna drive me insane I know it will. I can feel a visit coming on back to the dealer's??? Apart from that the car is awasome a big improvment IMO very smooth & refined love the vacoover's !!