First off, we have to celebrate that name – RocketBox? Awesome, we love it!
Now, to serious matters. This product is designed primarily for people with smaller cars. It has a much squatter design than normal, meaning that much of the space is generated by the width of the box rather than the length. So if you have a smaller roof area, this box can be installed without overhanging the windshield or stopping the trunk being fully opened.
You also get the high quality design and build you would expect from Yakima. So 12 cubic feet of storage has been squeezed into this model (excellent design) and you also get high quality locks, and easy to use quick release connectors (excellent build).
For hatchback style cars with that little less rack room than a SUV or Minivan this could be the perfect cargo box.