Renter beware. Thrifty will nickel and dime you. In fact, there will be so many hidden fees that you can likely rent two cars based on the initial quote. All the add-ons, taxes, and whatever else they deem necessary will result in hundreds of dollars in additional charges. Don't look for help from the call center. You'll be on hold for more than an hour, and if you have a question they don't want to answer, they will just hang up. If you would like to cancel the reservation or return the car early, a fee on more $100 will be charged. I strongly recommend going with enterprise because I have always had a very positive experience with them. Thrifty at Skyharbor International Airport showed me, at least when it comes to cars, to always stick with what you know. In the words of one Thrifty customer and Yelp user named Joanna T., "Thrifty=shifty."
Good luck with your travels, and may your business with Thrifty be better than mine.