I had the same experience with the aftermarket ones from SUTV. I even heated them on install with a heat gun to stress relieve them on install. I cracked one on my second trip with minor tree rubs. I was hoping that reports of brittleness only applied to cold weather but I was wrong. They were cheap by my standards but I will keep patching them up until a more durable option is available. I have the same question about the factory "S" flairs- are they more flexible/compliant than the AF offers?
Robin