We agreed to buy the Cilajet exterior and interior protection on the 30' IF the price is $800, which was far more than it was worth! There is some protection given by the application of the product on the exterior and on the leather and vinly interior. And there is a warranty of sorts against corrosion and tears/stains to the leather and vinyl.
How good that warranty policy is, I cannot attest to. I would say that this interior and exterior coverage is really worth about $300, and dealer cost is probably about $75 (product and labor together, not including service/repair coverage.)
I should point out that the vinyl flooring is very thin and very soft. We use carpet runners and a berber rug under our recliners to minimize potential damage to the soft, thin vinyl.
In future, for a 30' coach, I'd tell the dealer that I would buy it for $400, but pass on it otherwise. Or, better yet, just spend the $250 to $300 and get a good detailer to apply a good quality sealer, which could probably be done, depending on your geographic location, for about $250 to $300.
If you don't mind doing the work yourself... that's an option as well.
2016 Newmar Bay Star 3124 Class A
2015 Staffordshire/Heeler Mix ~ Kimber
2004-2016 Golden/Lab Retriever ~ Harley
2015 GMC Sierra Denali HD 3/4 ton Duramax
2016 Airstream 30' International Serenity-Recliners