Id never heard of this until I saw it advertised at Billy Bishop Airport in downtown Toronto. Used it to go through Customs in Newark. We did have to try a bunch of times to get the QR code to scan but this was a minor inconvenience as I skipped a massive lineup and only had to go to one with only a handful of people at it. Will be even better for flights with no checked bags as you get through customs before your bag is off the plane!