I think that the leather interior is an absolute rip-off at £1800, I don't think that it feels or looks special at all and I certainly wouldn't factory order it.
One other thing that I have noticed in the three weeks of ownership is that the heated seats seem to take ages to warm up, I think it's partly due to the cold side bolsters against your legs, I have never noticed this on any other heated seats I've had in the past.