I'll say this: for as effective as the product is, the company does not stand behind its warranty.
We had to have a door replaced and a lot of metal work done on the TBSS last spring due to corrosion/rot. When we went to Krown corporate they dismissed us, didn't follow-up, and ultimately blew us off. So don't expect the warranty to hold up.
We are still having our vehicles done by Krown, recommend it to friends with that caveat that the warranty isn't worth the paper it is printed on.
Finally, when you decide to get a new vehicle done ensure that Krown drilling holes in your e-coated panels is okay with the manufacturer and that they will still honour their corrosion warranty (most won't). We just have Krown use whatever access points they can on Natasha's Colorado.