Ahhh a theard I know alot about... I had my 05 SLE rust proofed to the tune of 600 bucks (high yes) but the guys did a great job. I would recommend it, my Impala got it too because the rust proofing on both those cars was like none existant. My GP on the other hand had a great job from the factory. I would have it done, I know it is saving my girl!