Other than the decals that say Signature, has anyone seen any material differences - other than sig red paint, white leather, and price? Is the "extensive leather" so different from production? I know that the car comes loaded with options (e.g. twin charger, high end wheels, etc) but I will have to make choices soon enough and am not sure I see what really makes the Sigs a "limited" version with differences that set it apart from general production..... happy to know if I'm wrong...