Glad to hear all of this. I was aware of the Costco return policy and the Amex added benefit for warranty. I wanted to offer the following ...
The first flat panel TV that I had bought was a Vizio 42" LCD (pre-LED) from Costco for ~$1300. Some 8-9 months into ownership the video card went wild and psychedelic presentation was at hand. Asked Costco what the best approach was for handling this. They said I could return it for a full refund, or get the manufacture to replace it since it was less than a year old.
I snapped a picture, posted it on a forum, and then emailed Vizio with the link to the forum posting. They asked me, "It it wall mounted?" and I said, "No." While I was not home the wife received an appointed visit whereby someone came in and replaced the unit with a new one. All costs covered by Vizio.
WOW, was I impressed. A year later this second unit had all of its HDMI inputs fail, which made feeding 1080 content a bit limited. Costco didn't care that this wasn't the original unit and again said, "Bring it in for a full refund." They also said, "We don't track serial numbers--just product make/model and membership IDs and purchase dates."
Wow, I was impressed again when they handed me a $1300 Costco gift card, which I turned around an bought a 50" Vizio plasma for $900. I spent the remainder on a Canon HD camcorder. Since then I added a 50" Panasonic plasma and both plasma TVs are still running strong--well outside the two-years of Costco-Amex coverage.
I am buggered though to know how this will be handled since Amex and Costco are no longer friends. Again, the consumers lose.