Maybe I'm just lucky, but I had a good experience with Alamo in Orlando after having made a reservation with another company and ending up with no car (see Payless). After a very short wait in a rapidly moving line, the Alamo desk clerk gave me the small car I wanted, with no reservation, with the least pressure to buy insurance I've ever experienced, with NO upselling, and all communicated clearly and courteously. Had I wandered into some parallel universe? And it wasn't much more money than the el cheapo place that didn't treat me right, despite being on-airport.