The story is not so simple as FourWinds being acquired by Thor...so, any Thor hate has no place here.
Mandalay Luxury Coach was an autonomous premium maker (like Airsteam has been since acquired by Thor in 1980 or like the Entegra - Jayco relationship). The companies operated separately for years, even after Thor Industries acquired controlling interest.
Damon was part of this mix too and our Damon is trouble free (knock wood).
These motorhome brands were only streamlined into Thor Motor Coach after the 2010 name change.
See: Thor Industries, Inc. - About Thor - Our History
And, like said above these brands used standard and quality components and little to no one-off systems for everything from slide drives to water heaters...all still in business and easy to repair/maintain.
FourWinds/Chateau is still the best selling line of Class C's in North America...Surely not the 2013-2014 (first year) Palazzo fiasco.
We would not hesitate to look at any Mandalay or FourWinds made RV.