I think the extended warr is a good idea, not so much for the powertrain, but ALL the electronics cars have nowadays, are costly, and pricey to diagnose, remove and replace.
The 3yr/36K covers us bumper to bumper (except for normal wear items, clutch, brake pads, battery etc), but after that, we just have the Engine & Trans covered for a few years more. I don't see the drivetrain as something that's likely to fail, but that's covered in the ext warr too. More so the electronics that control, well, everything. It's kinda daunting when you think about how much technology we have on cars these days.
I'd prefer to be covered, it's just another insurance expense I hope I don't need, but will be happy if I ever do.
I look at it this way, Honda's & Toyota's are known to be super-reliable cars, right? We can agree? So why are dealership service areas filled with Techs working on them, everyday? (They aren't living off of oil changes, you know that).
Being those two brands have an arguably much better track record than say, Ford or Chevy, I can't see not having the Ext Warr. But that's just my observation.