We were purchasing a new-to-us vehicle located in Southern California, under a small window of opportunity. It was way too expensive to fly out at such short notice and we did not want to pay for driving two cars back so we looked into doing a one-way rental. Fox was by far the cheapest out of any of the companies, but we were hesitant to book based on the reviews here. In the end we decided the price was too good to ignore and we booked with Fox.
In short, our experience was great. We picked up the car at 8am from the Sky Harbor location and although we were not the first in line the wait was only about 15 minutes. The girl at the desk was very happy and friendly, stating that it was a great job and she had been there for about 15 years! I'm not sure what the issues are with the other reviews here but maybe the key is arriving first thing in the morning if you can to avoid heavy lines.
The vehicle, a Chevy Aveo, was in good condition and clean with no funky odors. We did not have any mechanical problems with the car, however the gas mileage was not as good as we had hoped and the vehicle did not come with cruise control! Guess we should have gone for the upgrade.
The only thing we had problems with was finding the drop-off facility in Santa Barbara. They gave us no indication where it was on the Phoenix end even though it said the location was John Wayne Airport. After driving around a bit I finally looked it up on google maps and found that it was not at the airport, but near the airport although a bit hard to navigate to. When we dropped off, we were in and out in moments with no problems or extra charges. The guys there did kind of laugh at the price as I guess it was really cheap compared to California rates.
All in all, a good experience and I wouldn't worry about renting from Fox again.