I think there are two major benefits: first is that you don't have to call or hail a cab. People don't like talking on the phone, so being able to pull up an app and press a button and have a cab pull up in less than five minutes is pretty awesome.

Second, the cars are much nicer. Fairly new black cars and large SUV's vs smelly Ford Crown Vic's.

Also all payment happens on the backend so you never exchange any cards or cash. I expense Uber rides all the time and believe that enterprise sales might end up being one of their largest markets.