I think the obvious comparison is the Winnebago Via 25T:
Almost the same floorplan, 25' 5" vs. 25' 6".
The Winnebago is on a Sprinter based chassis, GVWR is 11,030 pounds, GCWR is 15,250 pounds. MSRP over $125,000 (Sprinter chassis really drives the price up?)
The Thor, as mentioned is on the Ford E350 chassis, GVWR 12,500 pounds, GCWR 18,500 pounds. MSRP $96,180 for one I found online. (The MSRP seems a little high, almost the same as an ACE, Forest River FR3, or a Winnebago Vista all of which are slightly larger Class A's.)
Is it a Via for 20% less, and maybe 20% less fuel economy? $20,000 buys A LOT of gas, even at today's prices.