There are certain applications where carbon just does'nt make sense, like crankarms.
Lighter maybe by a few grams, but not as stiff as aluminum and given the fact that this type of failure can get you and others seriously hurt, I wonder if there are any WW members who are still hell-bent on getting carbon cranks.
I agree with the post that mentions we see it more, because alot of WW's have these kinds of products. But on the whole the incidents are very small. There are tons of those cranks out there, and we've seen a couple fail.
Perhaps aluminum does make a stiffer arm, but not better. Al and carbon fail in different ways. Which is probably why Rich is still ok. Carbon breaks are generally not instantaneous. Even if they are quick, they usually give you a split second to ease up, or shift your weight.(not just cranks, but handlebars etc...) When al breaks it usually snaps very quickly leaving a rider off balance and crashing.
I've seen plenty of broken Dura Ace, Campy al cranks.
It's really not all about the material but the manufacturing as well. Bad ones will always slip through. It's about what percentage of the ones coming out are bad.