For those seeking a closed case, this model is well suited. Unlike many boxes for RPi, this model does not come with expansion slots. It is therefore not appropriate to use a RPi for experiments, but instead it is almost perfect for use RPi like a small computer or media center.
Only downside, the screw keeps the two half shells which are totally undersized compared to plastic holes and turn mostly into space without being able to lock the half-shells together. Fortunately, hulls are able to stay together without screws ...