Definitely recommend it both ways. You can stay in the lounges as long as they're open. If you have checked luggage on departure you have to do that first....and the desk only opened 3 hours before my flight. I left Jan 10th (Sat) at 3:40 pm, the line for security without Mobay was all the way down the lobby of the airport, with Club Mobay, I didn't have to wait in line at all, saved at least an hour. And I was able to have a shower in the lounge before boarding my flight. I also had them fill my thermos mug at the bar to take on the plane. Def worth $30!