PolySteel is a good product to protect the paint and the value of your car. I have used PolySteel on my last two Lexus and similar products on all my cars. I have never used the interior protection plan. I also try to use a "brushless" car wash as I feel the others cause abrasion and dull the finish. When I buy an expensive car, I want to take good care of it. I find my Lexus superior to the other cars, Lincolns and Cadillacs, I have owned. The service and staff are superior.
I hope this helps.