We have a fast track queue in Johannesburg and always forget to book ahead. We will be travelling again soon and will be booking this service as it saves about an hour at immigration. When you have flown 10 hors you want a bed and saving the extra hour is a no brainer. Also a corrupt airport which a service like this should never be required if everyone did their jobs.
RE: Phuket airport denies paid "fast-lane" exists. claims it never existed