Manufacturer-backed just means the dealer sticks a 10-25% profit on it.
An auto warranty is an insurance policy. They all use one of 3-4 different insurance companies / underwriting groups, and as long as you do your homework and read the documentation, there is no difference. Period.
I don't care what the dealership finance guy says (or the service manager), he/she's wrong. I sat through the training, I learned the shady "sell" tactics, and I researched other options. My Q45 got over $6k in repairs on a $1500 policy, at the dealer, with no hassles (and not a dime out of pocket).
The whole "manufacturer-backed" thing is salesmanship - nothing more, nothing less. The buying public is often too uninformed to figure it out.
