To our local fastest group ride. Not officially a race or anything. Easy out, hard back. One guy came out with a Cervelo P5 with a full disc on the back, and Zipp 808 on the front. Mind you this is in Kansas and yesterday it was 27mph winds. He had a hell of a time controlling his bike in the group and finally when we hit the turn around with the wind at our backs he was dropped.
But seriously, a full disc on a P5 at a group ride. Seems dangerous.