I've got a carbon trek madone, a blur lt carbon, and had a cannondale taurine carbon, along with numerous carbon bars, seatposts, cranks, brake levers, saddles, mech cages, and helmets. Never had a sniff of a problem in anything, yet i have broken plenty of aluminium stuff. High quality carbon products will outperform aluminium and steel alloy parts in many ways. True, a crash can cause invisible damage in the 3d material, but i have never had need to worry, and it's not through not trying hard enough! Many manafacturers have some sort of back-up for crash damaged parts just in case. It's worth pointing out, that there are a lot of crap "generic" carbon products out there, and i'd always be happier getting something from an established carbon manafacturer.