Chrysler Master Shield

I have a Chrysler 300C that is due to go through the Chrysler (Mopar) master shield process. I am particularly interested in anyone that has experience with the teflon paint sealant they use. Please let me have your opinion. Drawbacks? Does it yellow in time, does it eventually flake, crack, or peel? Please advise. I may just ask for my money back on the master shield if you don't feel it's worthy.