I just picked up my Cherished Mini Cooper S
JCW Convertible at the weekend, my initial searches were not the works version, however on the cherished mini website I always limited my search to those with the Chili Pack. So for me at least (and I assume others) it makes a difference in the appeal of your car when it comes to resale.
Oh and the 17" wheels look nice too along with the Xenon headlights and the sports steering wheel. All the other bits are nice and I think add to the car.