1) It is only available in the United States (why isn't that mentioned in the article?).
2) I wish Apple would allow things to be bought with AMEX through their App/iTunes store because is the one thing that stops me from owning an AMEX card - the lack of places where I can use it.
Where do you live?
I use my AMEX for almost everything:
Pay my cable/internet bill, car insurance, cell phone, gas, groceries, plane tickets, hotels, car parts/service, etc. I probably use it 90% of the time to build up points for miles or statement credit.
The only thing I dislike about my Amex Preferred Gold is that their Blue Cash offers better rewards and no annual fee with ability to carry a balance. I don't see any extra 'perks' for $175 a year.