Echo what other have said. I bought mine (an 08) with 24k on it and have a few minor problems, few door lock actuators, and rear defroster cable, all replaced under warranty, which I also added the GMPP for additional coverage.
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08 and up, if you can purchase the GM backed extended, get it for piece of mind.
How can you get the extended warranty? I'm nearing the end of my bumper to bumper 36k warranty.