It isn't even $100, it is an additional $15 when added to TSA Pre-check. Well worth it. The last Carnival cruise we got off and they took a picture and we were done at Customs. We have used it many times coming into the US from overseas and It is so quick and easy. Go the Global Entry area, put your hand in the fingerprint reader, use the camera to identify yourself, answer a few short questions and you are on your way, no long lines like when you go through Customs.