Have never used HA but have used Auto's Abroad twice and with no problems, both times we collected our vehicles from Dollar and the first time got upgraded from 2- 7 seaters to 2 - 15 seater minivans. The last time we used them we had a slight bump with another family from the UK - not my fault - he reversed into me, and it was sorted asap, and also had a slow puncture, which we had the choice of taking to their local garage to be repaired or to go back to the airport and change the vehicle, we chose changing the vehicle because the garage was closed for the night and we wanted an early start to Busch Gardens in the morning, and the airport was only 15 mins. away, changed the vehicle with in 5 mins. no problems at all.