Costs more and delivers less
As one of the most expensive car rental services in Rome I expected a high level of service. However, I had the worst experience with Sixt Rome Fiumicino branch which led to a series of terrible costumer service futile correspondences. It started with being given a lower-class car for a two-week rental — a much smaller car than the one I had specifically booked because I needed the extra space (and being lied to about it) From there, it went on to various customer service representatives sending me long replies that somehow managed to do both: acknowledge that my complaint was justified, while at the same time refusing to take any real responsibility for what happened. In conclusion- there are cheaper and probably better car rental services around.