I had one taht was brittle after 2-3 years. It wasn't broken but was easy to crack when I removed it once. I certainly would prefer to have that thing take the bulk of the uv damage and be sacrificial to the hail than the actual vent lid. In fact, I regret installing the maxxair maxxfan on the front vent in my rig for that very reason. I regular cover doesn't fit over it very well....
My thought at the time was that the lower profile when down would look so much better since it's so close to the front edge...and the larger one might even tend to be more noisy in the wind. Now, I wish I'd have done a more traditional fan with a seperate cover. Otherwise the Maxxfan is fine though....
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