I used the service several times and was satisfied with the service. However, last time the driver was really rude and hostile. He was not aware of the terms printed on the ticket (i.e., even though, the language on the ticket states the following: "To board, you must be able to scan the QR shown above on your phone or by printing this e-mail or the attachment" the driver wanted to refuse to accept it; the same issue as it was described by others too), and he seemed to totally forget that he was supposed to serve the customer(s) and not the other way around. I gave 2 stars due to more pleasant past experience.