It was recommended by a friend as being good for non canto speaker and I tried it this evening. It seemed to (eventually) find me a taxi which rang me up and told me his number (information which appears to be clearly indicated on the app) and then proceeded to drive e to the wrong spot (wrong side of my building, which is a huge difference in the evening). So I tried to cancel and could not figure out how. The "cancel order" button was greyed out. Gave up and just got in a normal taxi....
What is the benefit of this app?