You definitely need to read the small print of these ultra long warranties. It only takes a couple of words to exclude complex and expensive electrical gremlins , redefine what constitutes fair wear and tear over a longer period, etc and only cover things that are never likely to go wrong anyway. Or tie it in to expensive servicing and inspection requirements . Its likely other manufacturers long warranties also have similar exclusions. Much better the car doesnt go wrong in the first place. But an 8 year warranty would be nice. 
I extended the warranty a couple of months ago by 2 years to bring it inline with the 5 year service package. Whilst it was not so expensive, I was a little surprised after reading the small print on how many things are now excluded.
