A consideration mentioned above but worth elaborating, that if you choose to go to any insurance vendor other than General Motors, you sometimes have to incur the repair, then bill your extended coverage insurance for reimbursement, as more than a few GM's dealerships will not honor payments promised at a later date. And what do you do if that non-GM insurance company says that the type of repair you just had done, or is about to be done, is not covered by your policy, but you think it is. Conversely, with GMPP, my experience has been, no questions asked at the dealership and I paid just the deductible. Yes, have lost money buying GMPP on my two Corvettes, but heck, it is insurance and you purchase it as a hedge against a potential huge and unbudgeted loss at a later date. As an example, I took the gamble on our current Z06 as a new motor would cost about $15K..., and will buy a similar GMPP extended warranty on my StingRay (knowing it probably won't pay for itself the next time).
