I can only speak from my one experience with a Thor product which I bought used, and was the third owner. It was a 2000 Hurricane 30Q, 31 ft, no slides, just your basic motorhome. Most of the issues I had with the thing can be directly traced to owner maintenance, or lack thereof. All the components/ appliances worked fine after 14 years. AC unit died in year 15. Had some issues with the chassis (Workhorse) and not related to Thor.
The only fault I attribute to Thor was the drawers and some cabinets not being very well built. This may all have changed in later years. I have nothing bad to say about my experience with the 30Q.
When we went looking for our new unit, we looked at some Thors, but opted for the Newmar. We liked the size/floorplan/fit & finish of the Newmar just a bit more than a comparable Thor.
Tom Wilds
Blythewood, SC
2016 Newmar Baystar Sport 3004
2015 Jeep Wrangler 2dr HT