We rented a van from them last year. Don't remember the model, but it was fine for the six of us and luggage. We didn't have any problems at all. Pick-up and drop off was quick and they definitely had the best rates of anyone. Do a search on the Transportation Board and see what comes up.
Also - they are right in the MCO terminal and their vehicles are just our the doors and across the way from their location, which made getting out of the airport very easy.