interiors do wear really well. my old black one had black leather vaders, the car had done about 180k when i twas crashed, and the seats looks like they'd done 40k! the steering wheel was only just starting to go smooth!
all the leather in them is quality, even the gearknob and steering wheels leather has a brilliant feel to it, when i got myself and MR2 to replace the M3 i realised just how good the BMW interior was, the MR2 had done half the miles and the interior qualirty was 1/4!