Mrs. DivingPanda and I did the dive last April and enjoyed it (didn't have a chance to report back here). The staff was great and the equipment was all in good shape.
However, I will note that, as others have reported in other threads, the fish and other animals do not look healthy, and that was really sad to see. The jacks all have chunks missing from their fins and tails, and the yellowtail snappers have very little color. IIRC, some of the larger fish also had growths near their mouths. You are warned to stay away from the dolphin pen, and our landside friend reported that she saw one of the dolphins "going at it" with a hole in one of the balls they have to play with - entertaining for the adults, to be sure. The turtles all hover near the surface in the back of the tank, so at least you'll be able to get a good look at them if you do the dive versus looking through the windows.
Our landside guide did not have a good explanation for any of this, but it suggests to me that the fish and other animals are under a good deal of stress in the exhibit. Our divemaster didn't respond when asked about this either, while exclaiming that he wishes they could do more dives per day.
Overall, the Epcot dive is worth doing if you've never done an aquarium dive before. However, having just dove the Georgia Aquarium earlier that month and gotten a full behind-the-scenes tour of all the animal husbandry that goes on in Atlanta, Epcot does not stack up in many ways IMHO.