well if the front is fiberglass yes, I would say there is a possibility of those cracking but it would take a big piece of wood for road debree or a tap from another car to crack it, or even just removing the bumper for something when you twist it, but the only thing that I think shows its strength is they obviously got it on that car, and had to twist it a little to get it on so it may be all good.
if its poly then it should hold, for a while anyway.
edit: Price estimates$?$?$?$