When I went and viewed the car this past weekend one of the things I paid attention to was the extended leather. It gives a much more rich feel (and smell) to the cabin. It looks really nice too. It is soft to the touch, more so than that semi-hard spongy plastic of the rest of the dash. IMHO, I think it really livens up the interior.
I chose to go with extended and I'm glad I did. Now....if my car would just get here.