I think they rent older Moorings/Sunsail boats that came out of their programs, so you won't get the newer boats, but you will save money. Check out Conch Charters, they would be good competition; I used them successfully last summer.
Please Jhildy don't think! They have boats of all ages, and a lot of new ones. I chartered 4 times over the last 10 years with BVI Yacht Charters and never had a problem. Last 3 charters were with a new (first charter) and a nearly new Beneteau (a few months old / 1 year old) . You can check their website and make a choice of the boat you like. So you know the brand, name and year when you arrive. Good value, boats and staff. My next charter is with them again.