I've used Island Rentals now 3 times, and can recommend them, too. I applied for the World MasterCard a couple months before my trip where I rented for the first time - came in plenty of time and had no yearly fees. Cuts the rental car cost about in half - so well worth having.
The thing I liked about Island - just for peace of mind - was they have 24hr road side service anywhere on the island.
To prevent any dent/scratches claims - I use my camera and take about a 1-2 min video showing/talking about any flaws. I do this both at rental time and return time, with the agent present. I forget where I got that advice - but do it all the time, now.
