I haven't done the dive yet myself, but should be in the next few months.
I know several people that have done it at least once and a few who have done it multiple times.
The story is always the same.... IT'S GREAT!!!
You get to see more sea life than you could in a lifetime of recreational diving. Sharks, turtles, dolphins, almost any fish you can think of, rays, etc.
They take you on a tour of the facility before you dive, then you have an orientation where they tell what you can & can't do. Then they take you to suit up where all your gear is waiting for you. They use the top of the line stuff! Atomic regulators, etc.
They take you on a guided dive first then they turn you loose to do pretty much what you want.
If you can't tell, I'm excited about going & can't wait!!!
Have fun.