I was very impressed with the customer service at Enterprise PHX Airport.  First off, I find it a bit of a pain to rent a car from the airport in Phoenix because you have to take a 10-15 min shuttle to the rental car location (but this is the same for all rental car companies at Phoenix Airport).  That issue aside, check-in went smoothly, when we walked over to pick up the car, we were greeted by an employee sporting a suit.  He offered us a bottle of chilled water which was greatly appreciated.  He went over the aspects and condition of the vehicle.  Very polite young man.  Upon our return, the same young man in a suit happened to be the one who welcomed us back.  Very friendly service, and it wasn't just the young man we dealt with.  All employees I observed were very polite and friendly.  I will definitely book with Enterprise again.