Interesting. He suggests people do their homework, but obviously didn't himself.
Twelve years ago I spent a solid year researching RVs online before ever committing to one of the three brands I'd narrowed it down to (Fleetwood Bounder on a Freightliner chassis, diesel). Thor didn't make the cut. Also joined iRV2 and this forum lurking & learning over that time. All the while running my own business. So it's not like I had all the time in the world to research.
Did learn before purchase that Camping World is never to be trusted for service ever. And not the best place to buy because of the the poor service.
So yes, I agree, you should do your homework before purchase. One easy trick you can use these days is go to google and just type in "Complaints about Thor ACE", which just now brought up a link with 144 complaints. A good read for someone considering the product (I use it for nearly all purchases over $100). It gives an idea of the types of problems certain brands have and if they're willing and able to handle the typical problems the brand has on the road.
Everyone needs a little luck with these big machines but doing your homework is the best way to avoid most common problems.