Electro-Shield (rust control?)

I always wondered if this would really work or if it was pretty much a miracle sham. If you have any experience with this gizmo please respond.

http://www.jcwhitney.com/autoparts/Product/showCustom-0/Pr-p_Product.CATENTRY_ID:2000770/c-10101/Nty-1/p-2000770/Ntx-mode+matchallpartial/N-10101/tf-Browse/s-10101/Ntk-AllTextSearchGroup?Ntt=rust%20inhibitor

If you have no experience with it but would like to add your thoughts (or jokes!) about it that's OK too.