I have never owned one either, BUT....
I have a GOOD FRIEND that HAD a Montana and he had some issues with it AND Keystone... I also am good friends with a manager of a RV dealership that happens to sell Montana's.... I asked him one day why there were so many on the roads..
He said 2 reasons.....
First he said Keystone was the BEST at advertising and getting in front of the public eyes....
And he told me that is because of the price point.... They pushed a ton of product at a price point that folks like and want to spend. I have never owned one or really looked too deeply into one.. They look nice from the outside and on the surface..