I recently rented a car from Budget Car Rental at Dublin Airport. I'd made a reservation on line, but when I went to pick up the car I was told that my preferred size was not available. I was "upgraded" to a larger car at an additional cost of USD9.00 per day.
The car itself had low tread on the tires, the engine oil was at the end of its recommended life and the windshield washer fluid reservoir was almost empty. In other words, the car had been poorly serviced.
Finally, although my rate had been quoted in Euros and the final bill was in Euros, my credit card was charged in dollars. In doing so, the company added a 3.5% exchange rate fee. This added approximately $26 to my bill. This is unconscionable, especially since no warning was given that this was going to happen. All in all, a thoroughly unpleasant experience.