Did you know if you buy something with an AmEx card they automatically double the length of your warranty on that item?
Yes. Their Purchase Protection also covers theft so I've always made sure that anything I order online is on my Amex card just in case the package gets stolen. And, at least in my case, customer service has always made it easy to actually use this type of benefit. For that alone, Amex has always been worth price of admission.
Fun fact: One of my current main clients has one main client for whom I proof account offers and T&Cs. Guess whose benefits I am now even more intimately familiar with?