We used SAS last time and in one direction (FLL -> POM) I was very pleased and in the other direction (POM->FLL) I couldn't have been more unhappy. The driver was reckless. He was speeding and weaving through lanes very aggressively. It was extremely unnerving. This time around, I was planning to use FG Car Service (in fact I have a reservation) but I just figured out that for 5 people, it's actually cheaper for us to rent a van through Avis picking up at FLL and dropping off at the downtown Avis and using their shuttle. Same for the way back. Van rental for us is $70 there and $50 back for a 7 passenger van. The shuttle for the 5 of us was going to be $160 round trip, which was actually the cheapest I found.
Hopefully the Avis thing works out!