well i fitted mine weeks ago.. considering the quality of contruction and how every little hole was exactly the right place, i reckon it was $160 well spent. Only really because i already had the pod, and going back to a box would cost more than staying with the pod.
But as for performance.. only drove it one day with the box on. When i get it back will do some more "in depth" testing. I did notice the heat soak previously there, especially when driving in traffic and the like.