The headliner of my '04 coupe was replaced just before my "bumper to bumper" coverage expired. The thin outer layer of fabric had become loose from the molded form in a small area. It was visible with the rear hatch open. The fabric sagged enough so you could see about 1/4" of the material beneath along the upper rear edge. It didn't look like that big of a deal and probably could have been made to look decent with some double sided tape. I was surprised when they opted to replace the whole unit, without blinking. I would have accepted a repair on the original. I know now that would have been a mistake. From the reports in this thread I probably would have started to see other areas of sag. Be sure to look at the rear with the hatch open.