I am sure you've done your research in your usual thorough way Philip, but
from http://www.creditcards.com/credit-card-news/compare-extended_warranties-1273.php
Looks like you double from 90 to 180 days to me?
I could have missed it and thanks for correction so in my case I would be at only 180 days. Need to check if my Amex is better.
But frankly I really am looking to get the year warranty on this item.
So if all cc's will only 2x from 90 to 180 and 180 is far from roi this poll is a waste of them. Let me look further into my other cc's.
So far I found this and I will lock poll
http://www.creditcards.com/credit-card-news/compare-extended_warranties-1273.php
all of the above info indicates 90 becomes 180 unfortunately 180 days does not cut it.
So basically the poll is a waste of time as I won't buy the R4 with a 180 day warranty.
I would rather take my chances with another s-9.