My VW had a 12 yr. warrenty on the body but that didn't stop it from rusting out after 8 years.
These guys only cover defects based around improper coatings from the factory or defects to their workmanship. It doesn't cover things like "Road Rash" or the most commons ways it forms.
I had some fenders rust out on my Jetta but that was because of some sound deadening foam (that collected Water) used by VW. They realized this was a defect in their workmanship and replaced it.
My wheel wells starting rusting out but they wouldn't replace those as they claimed it was "Road Rash". They get very slick when it comes to things like this.
I don't want to take any chances...