I rented a Ford Mustang at the FLL location on Nov 6, 2013 , and besides other minor issues , a bigger one popped up as soon as I got close to my destination, some 100 miles away from the FLL station: the oil life indicator was showing 1% oil life and a message to change oil soon was displaying on the car's DIC continuously (even after being acknowledged).
I called Sixt next day and they told me to return the car to give me another one. I said I was too far and didn't have time to waste moving Sixt cars across South Florida. They told me then to go change the oil myself , keep the receipt to get reimbursed upon car return, which I accepted even if that wasted another 3 hours of my vacation time.
Then, when I returned the car on the 14th of November they wouldn't reimburse me. The attendants at FLL had no idea what to do, so I wasted another 30 minutes waiting for a resolution they weren't able to provide, time after which I had to leave the station to catch my flight, not being able to make the girl who "helped" me to at least provide me with her name. The only thing she gave me was a business card on which she hand wrote her managers' email address (which she misspelled, so the message I sent after I came home bounced back). I was able though to get/figure out the right email address ([email protected] ), so I wrote to Mr. Oraldo about the issue, providing him all info he needed to resolve it (including a copy of the oil change invoice) but 4 days later now he didn't even bothered to acknowledge the receipt of my email.

So, I will not rent from them anymore, at least until Mr. Oraldo and his team will be re-trained on basic customer service skills or replaced with more competent folks.

I rented before twice from SIXT Miami and haven't had any issues that I couldn't resolve in a normal way with them.

But with the guys at the FLL , forget about it, they really suck, at least for now.