I too bought the extended warrarty with my '06 LTZ. I think I paid $1700 for it?

I get advertisements for extended warranties in the mail all the time. But my '06 Monte is still under the factory warranty till april, 2009.

I can not verify these companies are legit or not? And I see ads in TV for place offering extended warranties to cars with under 150,000 miles and less that 15 years old.