I used Uber in Las Vegas and in New Orleans & it was great. They were prompt, they identify themselves on your smart phone, by giving you the make of their car etc. So when they pull up you know who they are.
There is no tipping & everything is put on your credit card, it's a lot less money than a taxi. Sometimes half of the cost of a taxi service. You can also ask for a SUV if you have a lot of luggage or several passengers.