Personally I'd have swapped the leather color, but then I've been burnt with std seats on a 3 series. They really hurt my back and I don't suffer from back issues, so always go comfort seats now.

You spend more time in contact with the seat than anything else in the car, if it's not perfect, it can be anything from irritating, to actually having to sell the car.. How important is interior color in comparison?

I wouldn't submit an order without at least 30 mins sat in the standard seat. Maybe even an hour test drive