Hello Christianb, I've been clearing in and out of the BVI from Gun Creek since they've opened up a couple of years ago. They are friendly, fast and the only negative thing I can think of is that they still don't have a credit card machine so you have to pay cash.
I don't know what GeorgeC1 was charged for, I only pay a couple of dollars there when clearing in and even my annual "temporary import duty" for the boat (which I need when I store the boat ashore for the hurricane season) is under $200.