Uhhh... Oh....

I'm now riding a C-40 whenever I can get out on it.

Pro riders and casual weekend riders may have very different demands on bikes, although I suppose one risk is getting previous pro bikes into the used market. So, a pro bike might get ridden 20,000 miles a year. Also the pros like to test and display "new" stuff so the old products get sold long before their life should be over.

However, perhaps one should also keep in mind ages. Some of the C-40 bikes are pushing 20 years old, and are an early second generation design just behind the carbitubo bikes.

Everything indicates that Carbon Fiber has tremendous fatigue resistance, perhaps better than steel, aluminum, or titanium. But, it is also a plastic hybrid, so it would have many of the same faults as plastic including potentially embitterment with aging.

Slightly different issue, but here is my last post on a Chinese CF seat.
http://www.bikeforums.net/18888639-post27.html

Apparently the makers chose to just secure the parts together with a drop of unreinforced epoxy. What surprised me was how hard, and potentially brittle the epoxy was. And the seat had only been in use for a few months.