IAH YYZ YWG today. OSS printed on BP at check in.
Arrived YYZ F gates, upstairs to catwalk down to customs hall. No opportunity found along the way to avoid leaving customs hall to take advantage of OSS to domestic gates. Still had to go through security (either upstairs or down) to get to D gates.
Hopefully some reroute for will take place soon, perhaps using the F gate cut over by the nexus machines?