We just dropped in for refueling, which took us one hour for customs and immigration (what for?). The refueling took 15 minutes.
Anguilla was a good place for staying overnight and refuelling.
Flight control was competent, refueling fast and the second time we could pay with Visa. A handling agent, who costs nothing helps you to go around with immigration and customs. Makes sense to leave him some $. No further costs besides parking fees. We booked a hotel with www.booking.com and the procedure was quite rapid. On the way back the refueling took us two hours because of the customs procedures. Although we did not leave the airport, we had to go trough the whole procedure, even a drug dog visited us …
Hawks Nest has specials for pilots http://www.hawks-nest.com/default.asp