It was really handy!
however, if you are at an airport that doesn't have full body scanners, you really don't need it. This was true for me when I flew from Philadelphia to Miami to Barbados for my honeymoon. Miami did have the full body scanner, but I was not chosen to go through it, so I just went through the metal detector and was fine. It's good to have them with you though, just in case.
This DOES NOT exempt you from but it is supposed to make things easier. It's called A Traveler's Communication Card and it comes from ConvaTec.