While not in Coral World, we did do a Sea Trek Helmet Dive in Aruba on our Wonder PC trip back in 2011 and it was awesome. I do research (both here, CC and Trip Advisor as well) before I do something but I don't necessarily rule something out for a few bad comments (especially if it is something that I would really like to do) as I have a tendency to believe people that have a great time don't report on it anywhere near as much as those that have a bad time. It is your vacation and your vacation dollars so the ultimate decision is yours.