The build quality is unfortunately not quite as solid as indicated in the product description. At some points of the frame ridge was present (cut during installation).
The design of the box has lasted much longer, since the holes of the frame partly did not match and had to be reworked by us.
Nevertheless, our dog feels (about 40 cm) in the box well and likes to ride in the car. The box has a good supply of fresh air and the dog has enough space.