i can say this i have never broken a blackberry without trying. i have had mine go down a flight of stairs, dropped on the street, my dad laid his bike down with the blackberry in his front pocket, they always worked.
i can put money on it that if i had one it would be destroyed in less than 2 weeks, however i am very harsh on phones i admit.
it is a delecate piece of equipment, no matter how you cut it.