As has been mentioned in the other threads 2oldman posted, I think everyone's experience with their manufacturer is different. Sure, our first Keystone bumper pull toy hauler wasn't perfect, it certainly had its issues, but nothing completely terrible, but we still bought a second Keystone, and have overall been happy with it. Others have nothing but bad things to say about Keystone.
I will say, the dealer we bought our current one from has been much better than the dealer we bought the old one from, and I think that can make all the difference in the experience.