I just used them yesterday to go from POM to FLL. Booked in advance. Got a text message at 7 am to confirm and advise when we'd be off the ship. We did self assist and walked off around 7:40. Called as instructed as soon as we exited customs and then the van was there a few minutes later. I don't think their van can sit outside the terminals and wait for people, so they only come around when someone is ready for pickup.
We were at FLL by 8:30.