Don't get this if you may have to cancel the service some time in future!

I cannot comment on the effectiveness of the service as I never needed it, but if you want to get rid of it you need to pay a cancellation penalty that is probably mentioned somewhere in the 2 point font fine-print or blabbered on the phone at 500 wpm, and that nobody will tell you about while making the hard sale. If you need this kind of service, make sure you ask how easy it is to cancel, and get it in writing, otherwise you will sit with useless timeshare.