The main reason I bought the warranty is for the engine and transmission protection. See, I bought my girlfriend an '06 Jeep Liberty with an aftermarket warranty(Zurich). The day we drove it off the lot the check engine light came on. Yeah, no shit, it happened!
Long-story-short, about six trips to three different Jeep dealers and the problem was fixed. However, not after the engine had been torn into twice, totalling over $4000 in repairs! The warranty paid every penny of it! (Said part is, I had to provide the dumb SOB's the TSB regarding the problem. They performed the TSB and voila! The problem was fixed!)
Now you can see why I bought the warranty on my JK. I didn't want to get burned!
The other reason for buying the warranty is because we live in an appartment complex and no vehicle maintenance is allowed
on the property. Having said that, I installed the lift in my '03 Jeep Liberty in my driveway.
I just don't tear something apart unless I KNOW I can reassemble it the same day. The landlord would have a fit to seem me tearing apart an engine or dropping a tranny in the parking lot.
Sometimes I don't think I'll ever use the warranty unless something catastrophic happens. The nearest Jeep dealer is over an hour away. Between the $50 it would cost to drive my Jeep there and back; the $100 deductible; and the time involved, its quicker and easier to fix the shit myself.