Yes, there can be a lot of unpleasant yaw (side-to-side) movement back there. Remember, yaw and pitch are centered around the wings and then amplified by your distance from that point. Hence, the tail, being furthest away, experiences the greatest degree of movement. Sitting over the wing is the smoothest location because the yaw and pitch are minimal there.
Last edited by Mark in CA; 17th Oct 2012 at 10:40.