While the amount of people that will have an issue with a carbon frame or components will be very, very low, my main worry is the way it fails. Aluminum is similar. After going through a very bad broken leg last year and basically losing the entire year, I'm much more cautious about this kind of thing. Fork or frame fail on your suddenly and it's going to be a bad day for you. I went with steel and titanium due to they simply don't suddenly fail like this. Yeah, not as good performance wise, but I'm simply a recreational cyclist and just want a nice riding bike that might not break my good leg.