My bad - I quoted the price for the Force XT XXL ($850), you are correct the Motion XT XXL is more ($1050). Looks like the Force holds a little more gear, but I can’t vouch for that one. We love our Motion box.
I bought mine from direct from Thule and paid full price, $1050. The freight delivery company damaged the box in transit, I called up Thule. Real person answered the phone, got the replacement authorized in 5 minutes. They sent a new box the same day + free expedited shipping (through a different company) because our road trip departure date was rapidly approaching. I went from being pissed to pleased quickly.