I really like Uber,
Haven't used it loads but when I have I have found it affordable, convenient, prompt and the drivers have been both friendly and professional. I recently used it at DLP, the driver rocked up in a suit and tie gave us bottles of water and he had USB chargers in the back for a quick charge, only small things but they go along way to making a regular service that bit more personal.
Such a shame London doesn't view it this way.
Fun fact....
Whilst in Dubai my daughter Uber'd a chopper.