[exogen]

Convenience and reliability. Lots of people have stories of cabs never showing up, or taking forever, or barking and grumbling when offered a credit card as payment. Particularly if you're in a hurry, paying with a credit card also seems to take a lifetime – at least with cabs that use the paper carbon copy method (which they do here in Seattle).

Uber experience: you open the app and see on a map where all the cars are. It tells you exactly how many minutes the closest cab will take to arrive. When you arrive at your destination, you just hop out. The app knows what credit cards your account has on file and will just charge the one marked as the default or the one you've selected. There's no tipping. If you're in a hurry, not having to wait around to sort out the payment is a big deal.

I've never had an Uber not arrive or arrive exceptionally late; when I've had a less than stellar experience, customer service has been extremely responsive and offers refunds. On a recent trip, the driver made a poor route choice just because there ended up being a bunch of construction downtown, so it ended up taking longer than it could have. Customer service adjusted my fare to what it would have been had we taken the optimal route.