We used FT several times in the past for MCO to the S/D and to BWV. Overall no major issues, though they did charge us extra one time because our flight was delayed.
I would have considered using them on our trip last month but they no longer had the large vans available, which we needed because we were a group of 8.
We used Mears Global this last time (their private service). It was MCO to Universal to WDW to MCO. Total of 12 people but various combinations due to some staying at different hotels from others. So was a total of 7 rides and all arrived early and went off without any problems. Cost was $50-something up to $109 per ride.