Don't take this as gospel, but to us it sounds like the car was "lemoned" - in other words GM had to buy it back. Ask the dealer if that is the situation. It's beyond our comprehension why a problem like you described could not be fixed by a competently trained XLR technician. You also need to know what the warranty status is. By that we mean the Cadillac warranty - is it still in effect (it should be with only 9,000 miles on it)? That could be extremely important with the circumstances you cite. It will be quite difficult to have recourse to a dealer in Wisconsin, regardless of what they may be saying as far as standing behind it. It's the Cadillac warranty that's important.
In our case we've had virtually no problems - certainly nothing of any consequence, but also we should note we only have 4,200 miles on the car.
Since you've had difficulty posting your question on the XLR forum, we're going to put it there for you. Some of the participants, no doubt, will be able to offer valuable insights.
Best of luck to you.
Ed and Sandra