Trek had an 'affordable' hybrid composite bike, the Trek 2100, that merely twice as expensive as any reasonable hobbyist would pay for a bike instead of 5x as expensive. It was carbon tubes (they had patents on making them) and aluminum lugs, but the bond wasn't always good and so they would crack, chip, or delaminate. Big recall. The one guy we knew who had one rode it until it broke and then sent it back. That was a pretty long day for him (I can't recall if he rode it back gingerly or had someone pick him up).