I suppose I am one of the few here that has the dealer service my vehicle, a 2007 Pathfinder with 150K on it (I put a lot of miles on my SUV-this being retired is a LOT of work).
I really like the CS reps and all of them have told me NOT to buy an extended warranty as many of them deny claims as posters above have noted. They said there was one that wasn't too bad, but still didn't recommend them.
So far (cross fingers, knock on wood, pray for mercy) only routine problems, batteries, tires, brakes, one tune-up), but I know, eventually I'll have to spend some money on it.
If it wasn't for car salesmen, I'd probably already have purchased a new one. But, that's another story.
Bob