I’ve had RAC warranty twice, primarily because I’ve bought cars from Imperial Cars who sell it as their default warranty. I would buy it again. I’ve had to claim and RAC didn’t try and snake out of paying. They’ve also been easy to deal with, which in reality means I didn’t have to deal with them the garage did, which suits me.
The one interaction I had myself was transferring the warranty to a new owner, which was simple to do.
At the end of the day these things are insurance policies (literally and figuratively) and just like normal car insurance, the only thing that matters is paying out when you need it. RAC did, so I’m satisfied.