I have used them for the last 2 years and have been very happy with them.
In 2005 they were even at Sanford @ midnight when we were delayed 11hrs.
In 2006 we also used them to get to the port for our cruise and then back to wdw. On the way back to SSR we requested that they did a grocery stop (free of charge) and they took us to a publix just near to the port - the prices were very reasonable compared to the orlando prices.
The only thing I would get you to check the pick up time for the port -I had booked 9am pick up from SSR as I wanted to be at the terminal early. When we were picked up from the airport two days beforehand the driver said Im picking you up at 11am - I said oh no Im meeting friends at 10. He then said no problems (dh thought he wanted a lie in on Saturday - tough!!)
I used them last summer and they were fine, no problems, however i also used Sunray transportation on my October trip and they were somehow superior, better service, more personal touch, better with bags etc, so I have chosen to rebook Sunray over FlTours but they were still ok.