Not as bad as we thought
Pros: We rented a 4 door Jeep. It was in fantastic condition (only 600 miles on it). The Jeep did well over the week - we even brought it over to St John on the car ferry and no problems. Drop off was great - very easy and quick.
My sister also rented a "new" Jeep from them but the tire was low when they got it. Dollar assured them, it just needed air once and would otherwise be fine. They spent every other day getting air in that same tire. Luckily nothing major happened, but it was a total nuisance to have to get air 6 times in 10 days.
Cons: Slow service picking up the car. They try to upsell you consistently by threatening that if anything happens to the car you will be charged for all the days it is out of commission, the $250 cleaning fee for excess sand, etc.
They are offsite so you have to take a shuttle to the location. Not s huge deal unless like us you are lugging lots of bags and kids.
Prices are pretty standard in St Thomas and St John.