I have that same box. I've owned several roof boxes, and there is no comparison to the Boxter. It's expensive price is well worth it.

I run it on my STI

 

So REI is running a 20% discount site wide from now until Labor Day. Based on all the great info on this thread, I picked up the Yakima Whispbar Rail Bars (S55) for $320 + tax, which is only $30 more than OEM from Suncoast. Preferred non-oem bars as it would be cheaper for attachment addons. In addition, I also ordered a Thule Boxter roof box - it is back-orderable.