I'm sure you're aware that you can get a bad trailer regardless of manufacture, right? I want to say that first because I don't want people to think that I'm trying to flame their favorite brand because that is not my intent. We bought an '09 Cougar 29RLS because of the floor plan and price. Since our purchase, I've come to notice some thing's in a trailer that I don't like. Example's, I don't like the way the interior wall's give when you push on them. I don't like the way the main entry door will bind if you put too much pressure on the rear stabilizer jack. I don't like all the noise from outside the trailer that you hear while being inside. I don't like the fact that Keystone denied my claim to fix my roof that is now "bubbling" along the edge's the entire length of the trailer on both sides.
I think that most of the things that I don't like about my trailer would be eliminated had I spent more money, you know.... "You get what you pay for!!!" I've seen, heard or read about more than a few cases of delamination on Keystones, too, mostly Outbacks. These are just a few of the reason's that we probably won't get the Montana that both my wife and I fell in love with.
As far as our next trailer.... Excell, Jayco, Carriage, Double Tree, not sure. Hope this helps.