The one thing they do not tell you is that THEY own the warranty company (if it even exists).
When I filed a claim, they denied it saying that it had expired. I had only been driving the car for 3 or 4 months.
I bought an "extended warranty" up to 100,000 miles.
They would not even let me speak to the sales person that sold me the warranty. I have even spoken to X employees of Van Chevrolet, and found out that they are the typical used card sales organization. (very dishonest)
My advice is to tell everyone you know to NOT shop for a car there.