I purchased mine from the dealer for my 08 - I put the max on it (zero deductible for miles and time) even tho I have never exceeded the miles limitation. My warranty is good until 2014. Have an extended warranty on the 02 that is 3rd party. Have not had to use it and it expires next year. I like warranties as they give me peace of mind. Seems like all my problems come after the warranty expires. One interesting note, I had an extended warranty on my 03 blazer. Had an oil cooler line go bad (happens to all my blazers) and the dealer quoted me $650 to repair. Then I showed him my extended warranty (which he sold me) an they fixed it and charged the warranty $350. When I asked, they said they have deals with insurance companies that reduces the amount they charge, but do not have the arrangements with the customers. In the long run, I lost money, but if it had been a major overhaul I would have come out ahead. So you have to flip the coin and decide what you want to do. I am getting too old to work on my cars other than oil changes and minor repairs, so it is worth it to me.
Barrett