The material they use is almost aircraft grade, making it very strong, but slightly more brittle upon severe impacts as almost all of the glue is removed. I use fiberlyte shock towers which are 'laid up' carbon fiber and have more glue left in, allowing the product to be slightly flexible and a little more forgiving.
The problem is when you crash, the shock tower digs into the carpet and breaks along the weakest point- the one with a hole in the middle. Since changing to fiberlyte shock towers i have smashed my car into walls, dug the tower into carpet when coming off big jumps upside-down, wiped out other cars, and not had even a crack!
__________________
B4, BJ4WE (x2!!) 
|