No, I haven't. I live in a city, a cab took 15 mins to arrive after calling the dispatch service. Uber can take just as long, because the request bounces around

No, I haven't. I live in a city, a cab took 15 mins to arrive after calling the dispatch service. Uber can take just as long, because the request bounces around different drivers in the area, the time to arrive is dependent on which driver accepts the offered rate and how far away they are. I've had to request rides more than once because the Uber-set price was rejected by all nearby drivers. When I lived rurally (in college) cabs had to be booked in advance, that's just common sense.