I got mine used, it was 1y old and near the A Pillers by the sun visors it was just starting to come off there when I bought it. Now, 3y later I was driving down the interstate with the windows down and the whole thing fell at once... I had to pull over and cut it off with my pocket knife so I wasn't driving with the headliner hanging in front of my eyes.

I went to Michael's and bought some headliner material (you need 2 yards) for $25 (looks exactly the same as OEM). And I bought a can of 3M Headliner Adhesive for $10. Took me about 4hr total but I refinished it and it looks better than the day I got my car. It's not that hard.