Subtle curves and traditional style instruments with modern white LED distinguish the interior of the CLK - but it's more focussed towards comfort rather than performance driving. The analogue clock is the same size as the rev counter, perhaps hinting that ringing every last rpm from the engine will not be a priority for the owner. Materials feel reassuring in quality compared with a few earlier models from Mercedes-Benz and visibility is good - albeit with the inevitable compromise of the tapering roof-line increasing blindspots to the rear.
It's passable as a full-time four seater with adequate rear legroom for children and enough headroom for most passengers, but it can feel a little claustrophobic in the back. It does a good job of cocooning occupants from the outside world though. The earlier CLK270 CDI models have more intrusion from engine vibration than other models. The later diesels - especially the 320 CDI - are much better.
Wind and road noise are kept to a minimum though, even at higher speeds.