I've owned many different camping trailers over the years. Many different brands, sizes and configurations. Not one of them fit our likes and needs 'perfectly', but they were close enough. Always bought something that fit as close as possible and modified things to our liking. That's part of the fun for me....tinkering.
When it comes to brands and models, I can't speak for the high end luxury products...but when it comes to brands like Palomino, Keystone, Jayco and such...they are very similar products. I bought every trailer I've owned brand new and every brand had fit and finish problems, things that didn't work properly or some sort of defect. QC'ing could be stepped up at every manufacturer IMHO.
All in all...I've always been quite satisfied in the end. I end up fixing what I can and drag it to the dealer if its something major.
-2004 Nissan Titan w/Equal-i-zer hitch
-2014 Jayco White Hawk 24 RBS