I liked my worn Silver Alcantara insert seats; enough to give up the all leather, black, heated seats that had 60,000 less miles of wear on them to get the Silver inserts back into the car.  Fortuitously there was an S4 owner nearby who was looking for a good condition interior, so we met up and did a swap.  Out with the black leather and accompanying door cards and in with the Silver Alcantara and aluminum belt-line trim.  I still need to swap the trim from the front dash, but the interior swap is 95% complete.