Renting a car can sometimes be expensive at Sky Harbor airport. The cars are also offsite so you have to take a shuttle to your assigned vendor. I've gotten used to the routine but after we started comparing prices we've opted to rent a car offsite. We choose another Enterprise location that was between where we were staying and the airport. That's how we decided on this location.
On a recent trip we looked at rates at the airport ($1100) and offsite at this location ($550). Both for a standard car. With the savings it was an easy decision to decide to rent at this spot.The staff here greeted us with a smile and were more than accommodating. They offered us a free upgrade from our standard size vehicle to a small SUV! When you return the vehicle you can either bring it back to the same location (no charge) or drop it off at the airport for an additional fee ($50).
Moral of the story: Compare rates first and if you find that you will be saving a lot consider renting a car offsite. It truly is worth it!