I know that MasterCard and Visa offer an extended warranty for free when you use the credit card, but I recently learned that AmEx does this too. On their site, they just say that the manufacturer's warranty is doubled. I believe MC and Visa only offer a max of 1 year; does Amex also have a max of one year? Also, what's your opinion on Amex vs. MC/Visa for purchace protection and extended warranties?
