I bought 2 sets at autozone. The first set went on my roof rack and a year and a half later, I bought a set for my newly installed front bumper. At that point, the roof lights had begun to get foggy and the bottom half of the reflective backing was started to crumble. Now, another year and a half later, the roof lights are completely rusted and the bumper lights have caught up with them. They aren't nearly as bright as when I first bought them.
Spend the money on quality lights so you don't end up with this problem.