I never rented from Sixt before and was apprehensive, especially reading some of the bad reviews. I must say, however, that my experience at the 4332 Collins Avenue, Miami Beach location was nothing but very positive. Maybe it was just good luck that when I arrived on a Monday morning at 11am there was nobody there and I was able to go right to the counter and talk to a representative. There were 4 counters staffed by 3 people. The rental transaction went smoothly, no pressure or upselling, and I was out and on my way shortly with the intermediate car I reserved. When I returned it one week later, also on a Monday about 11am, there was a line of people waiting to see a representative but I was able to just walk up to someone at the counter and return the key no problem. I received email confirmation a bit later. The location is across the street from a Miami Beach Trolley stop so getting there and leaving is easy. I don't usually write reviews but feel this Sixt location deserves credit for efficiently handling my rental and on that basis can recommend it.