It's really a guessing game. The problem is on days where they aren't expecting many incoming passengers they lower the number of agents working. Last trip we traveled on New Years Day, figured it would't be busy and were correct. MoBay would have saved us no time at all. We did buy the departure service at the airport on the way back so we could use the lounge, but the time saved going through immigration was minimal. Prior trip arriving the Saturday before Christmas we saved 1 1/2 to 2 hours coming in.