The worst experience I had for car rental ever. I have been using Budget rental many years (at different locations) and never had any problem.
I went to them with my reservation and showed it to the representative (Dustin). He asked me if I want different car and my answer was no. But he gave me upgrade ($31/day) without any notice. (They seem to do this to many ppl if you read their review.) I had question with final charge but he said the discount will show later (I had a BCD code). It turns out that I was charged for a luxury car. When I complained, they treated me like a liar. I will never do business with someone who never honor their customers.
By the way, their manager even do not know that the time difference between Boston and Phoenix is 3 hours after Mar. 10th (daylight saving). He kept correcting me when we talked on the phone. I don't know who is the stupid guy. Maybe it was really me because I did business with them.