ones through the finance companies or larger insurance companes (geico, state farm, ETC) are worth it but the ones like US Fidelis, and MOGI are scams.
a friend of mine had US Fidelis and they wouldnt fix her transmission when it went out on her Jeep because the mount broke too and thats not covered. They said if she diddnt have a broken trans mount too they would have fixed it but since thats not covered they wont pay for anything. She ended up taking them to court. They still did not have to pay to fix the repairs but they did have to refund all of the money she paid which covered the repair costs.