St. Lucia Airport Shuttle provides a great service and alternative to your typical taxis. When I arrived, there was an employee waiting for me with a my name on a board and a confirmation number that correlated with what I received in my email (prior to arriving). The conversation was good and there was a complimentary bottle of water after my long flight.
The service was so pleasant, I decided to use St. Lucia Airport Shuttle for my trip back to the airport after a week stay on the island. I received the same level of satisfaction.