I agree with tarwheel - if you can mount a rack (I have heard of pepole mounting them to carbon)and fenders, all is good. I don't consider carbon to be any less strong than other materials, and think it gets a bad rep with people thinking there is a shelf life to it. The only thing to worry about is a crash - and even then chances are your frame will be fine. When carbon fails, it does so catastrophically, not like steel or aluminum where you can have a crack in the frame. As for theft - not everyone lives or works in a location that has a lot of crime, or they already know they can park their bike inside. I wouldn't hesitate to commute on my synapse if I wanted to put a rack on it - but I don't.