Just started with a used Discovery and have GS, FMCA Assist, and Safeco. Haven't had to use them (yet) so no idea which is best, however the Assist gave me access to a live technician who helped me through the "Low Air" problem (sensor) and an electrical guy to help me figure out where the slide out control board was located so I could disconnect it after it decided that the slide should be closed and did it on it's own. I could hear a click as it kept trying to close the slide all the while tripping the resettable circuit breaker (bump, trip, stop, reset, bump.....) but had no idea where it was hidden. The tech assist alone (if you are mechanically/electrically inclined) is worth the $109 the FMCA charges. for all the other stuff one of the three should "hopefully" get me out of the situation I get into.
cheers,
Clay
