I used Synon in the week before last. He was terrific.
He was waiting at the airport with a sign (and a big smile), even though the flight was much later than I had originally told him & we were delayed at customs. He's prompt, pleasant and a safe driver. He recommended good activities and good restaurants. The van was a bit large for 2 travelers, this was fine-- groups of up to 6 or so would be fine, too.
Let me know if you get a trip advisor page up for him, I'd write a nice review.