Mine has held up fine and I have the newer kit with the adjustable tips. I love the sound and theres no rust that I recall on the cat-back. Very good kit for the money, my only complaint is you have to play with the tips and the pipes to get them looking straight without rattling. But it's not bad, just have to mess with em a bit. Worth every penny imo, and still looks great underneath.
EDIT: Been running myn for 2 years btw.