The Thule XLarge box is not easy to load as top does not open up enough to have access for larger items. The support arms at each end that support the top in an open position are fragile. The ball joints at the top of the arms repeatedly separate from the plastic sockets and must be forced back into position. On a positive note the box is aerodynamic and I have not heard any wind noises at high speeds. Be careful of the extended height with the box mounted on top.