My wife's explorer had a steering rack go out over the 3 years, but under the 36K milage. It was quoted at $1600 to repair it. I got Ford to cover it, but it took a month to get it approved and get it done. If I had had the warranty it would have been a non-issue. I never considered the warranty for her car. Now the transaxle side shaft seal is weeping at 50K miles. She is easy on t he car, they just don't build stuff like they used to.
On a diesel truck the cab has to come off for any major engine work and the emissions is no joke and can cost a small fortune. Then there is the electronics, labor cost going up, and commodity prices increasing. Again, I am not a big fan of warranties, but at $3K for 125K miles and 8 years I think it is worth it.