We had a really great experience with Alamo rent a car. It was easy to hop on the shuttle bus to the rental car facility (where all the rental car companies were located). We stood in line for about 15 minutes (a relatively short time compared to other trips elsewhere that we've taken) before being served by an Alamo employee. They offered kiosks to check-in but because I made a reservation with Costco, and was allowed another driver for free, we opted to speak to an Alamo employee instead.
Service was super fast. It took about 10 minutes or less to check-in and then we were off to pick out our car.
I'm giving 4 stars out of 5 because their selection of intermediate cars was very limited. There was only 4 cars for us to choose from. Unfortunately we chose the Nissan sentra. The car was great except it had absolutely NO acceleration power (an FYI for those of you that have never driven a Nissan Sentra).
Checking the car back in was a breeze. It took less than 2 minutes for us to check the car in without any issue. It was also easy for us to take the shuttle bus back to PHX airport. We made sure we had at least 3 hours before our flight departure time to allow for any delays but thankfully there were none! The Alamo employee was helpful in letting us know which shuttle bus to take depending on the airline we were flying on.
We would definitely go with Alamo again, especially with the rates we got from Costco.