We purchased the fast pass super last minute, on the same day as departure flight. To be honest they don't do much. After purchasing I got contacted by whatsapp and sent them my flight/ passport details . We met up at check in gate and the staff brought us to the handicap/ ABTC lane directly to line up and they left. Being said that if we were to line up at the regular lanes, it would be so so much longer. Definitely saved 1 hour of waiting in line. High reccommend. Some other guy next to us literally just shoved 500'000 Dong in his passport while lining up , i mean he got his way in too . lol but we did it the proper way and it was well worth it.