Should be simple and trouble-free, but...
I've bought these gift cards before, without problems. But this time I purchased 6 together. One of the cards, given as a gift, turned out to have had no monetary value assigned to it. I managed to sort things out by calling Amazon customer service, but it was a bit awkward hearing from the card recipient that the card didn't work. I guess this situation can be avoided by printing out a gift card/certificate at home, but it's not the same thing.
Rating: 3 stars