I fitted one of the GRP ones from Revolution. No problems with sagging as such, but within 3 weeks of putting it on the car I caught it on a cattle grid which fractured it all the way from side to side. Subsequent scuffs here and there in multi-storey car parks have left is in a bit of a sorry state. Glad I didn't go for carbon as I would have been a bit more annoyed with myself if I had buggered it.
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