I don't want to get into a debate over the shark feeds--I tried to give a view of what to expect and Halcyondaze is a veteran of these dives so his description is good for you to consider also.
And, let me echo Halcyondaze on the turtles. There were a surprisingly high number of turtles for this time of year on my most recent dives. Seeing 5, and good, close, long sightings, on a single reef is not typical even in the summer peak season. It's unusual for this time of year. Regardless of how I feel about shark feeding dives, the presence of turtles, if that is a "big animal" you like to see, would weigh strongly in favor of adding reefs to your trip and not concentrating solely on sharks.
And, let me echo Halcyondaze on the turtles. There were a surprisingly high number of turtles for this time of year on my most recent dives. Seeing 5, and good, close, long sightings, on a single reef is not typical even in the summer peak season. It's unusual for this time of year. Regardless of how I feel about shark feeding dives, the presence of turtles, if that is a "big animal" you like to see, would weigh strongly in favor of adding reefs to your trip and not concentrating solely on sharks.