I've used this car service many times to go to/from the airport on business trips. The drivers are always at least 5-10 minutes early picking me up from home, which is great because sometimes I want to leave a little early.
They're also very courteous and take care of your luggage and door when you get in/out. They hate it when I do it myself....that kind of stuff doesn't matter to me, but I've learned to let them do it because I get the feeling that they're required to and will get in trouble if they don't. I have no idea how they would be audited, but I just go along with it.
The cars are always well kept, comfortable, and the AC is always on....in Phoenix, it's important to have the car cool. There's controls in the back for you to take care of the temperature if it's not right for you when you get in. There's also a complimentary bottle of Water waiting for you in the back as well.
Overall, it's an awesome service.
Return Factor - 90%