Jet, they are just not durable given their function and operation imo... My bike fell over a few times and twisted the saddle sideways. Now there is a big score going right around the post where the seatpost binder is and I'm afraid to ride it lest it snap off and go up my ass all of a sudden. Had it been an alloy post it would simply have not been an issue. I find I need to crank my steapost binders pretty hard to keep the steapost from slipping, and I don't like to apply that much force to CF. Maybe high end CF posts don't have this problem, but I really don't like the idea of a seatpost being so easily comprimisable.