Global Entry is fantastic. If you travel light you get though customs in less than two minutes and that is not an exaggeration. Eye scan and about 5 questions so if you don't have to wait for checked luggage it is worth every penny.

We also have used it in other countries. We entered New Zealand using Global entry. I only wish they had it in Prague. After 14 hours of traveling the slow and intimidating customs there about ruined our trip.