We have begun using Club Mobay recently for both arrival and departure. While it is true there is more value in the arrival portion, there was a couple of times that the line to get through security on departure was completely through the airlines' check in area to the restrooms on the left (as you walk into departures from your taxi). We did not have Club Mobay but did buy it after we checked in with our airlines and it saved us from potentially missing our flight.