Man I just read all of this. Makes me sick. How can someone repeatedly shell over that kind of cash money and then have the dealership disrespect you? You are a valued customer, it sound slick the majority of the experience they worked with you but that last guy sounds like an ass. I know how it is to be between vehicles and have to get a rental and it just stressful, you have other things to do, like work and family, than search for a car or wait for it to get fixed, even if you are a car guy.
How do so many people have this problem, among others, and GM let it add through R&D and QC? I personally love my 07, yeah its 7 years old but there are no problems with it and it is a blast to drive. I could never imagine going through the ringer and still ending up with a second bad vehicle. I really feel for you brother, it's really unfortunate.
And BTW props to you for keeping your cool. That would be hard with a consistent problem and so much time and effort and money involved. About a week into it I would have burst, but like you said they didn't design so no sense in yelling at them.
So are you enjoying the 14? I really think the GMT900 platform is nice.