I booked a round trip shuttle service at the airport. I had a good experience actually. $14 per person for round trip is very affordable. After I brought my tickets, an empty shuttle was there ready for me. Very smooth driving and driver was friendly.
For the return shuttle, i booked one day ahead. They told me to wait outside the lobby at 5:30pm. I arrived on time but no bus and called the company, they told me the bus number and asked me to allow 15mins traffic delay. The bus only late about 10 mins. That was ok. Nothing to complain about.