We had a warranty with SA Warranties I think, during which time we had one mechanical breakdown and needed to claim.
I cannot remember what it was, but I do remember them refusing to pay (either fully or the portion not covered) due to non-coverage of parts that needed changing to access the actual mechanical failure.
I gave them hell though - these aftermarket warranties are generic, not vehicle specific, so it doesn't take into consideration the additional steps involved in order to repair/replace the covered parts. I just argued that it was misleading to provide coverage and refuse coverage on those terms - eventually my unwavering battle panned out and they covered the total cost.
It's mostly not worth it on cars these days - it's mostly a buffer for the savings you don't have when you need to cover a repair you definitely didn't budget for. I'm sure some people are wise at keeping emergency funds in place for incidentals, I'm just not one of them - eek. I guess it comes down to whether you need that safety net vs keeping a savings stash to cover huge incidentals yourself. Either way, good luck!