Most thrird party extended warranty is set for ripe you off.
When you going to use the extended warranty, the prolems will come like these: the company that warrantes your car is gone. If they are still exist, they will say like this: "This part is not covered", or "you did not maintain your car as specified", etc. They can always find some reason that do not pay or payless, you will have a lot of head ache to deal with them.
Google the internet you will read a lot of horrible stories about the extended warranty.