I will never purchase an extended warrantee from anything but the manufacturer.
3rd party warrantees are awful. The dealer is required to call and get a pre-repair authorization before proceeding. The warrantee I had took 3 days for them to respond both times I had an issue and the car was in the shop for those 3 days doing nothing.
With the Toyota warrantees the work proceeded immediately.
Not to say you should purchase it at an exhorbitant price from your dealer but make sure it is a Genuine Toyota policy.