Seems like it works as it lets you book a taxi to the main airport entrance. Taxi accepted our booking and appeared to be due in 3 minutes and you can follow its progress on a predetermined route to your location. You can also watch it go to a different street and leave you stranded.
Both you and the driver can cancel the booking. But if you try and get a new driver, the original one can keep accepting and cancelling your booking to leave you hostage in a never ending loop of stress, frustration and confusion. There is unfortunately no way to talk to the driver directly to try and resolve the issue. The option to call in the app only allows you to keep making new bookings through an automated system. When you realise this and hang up, they will call you back to make you do it again.
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