i was on aqua cat a year ago. my only comparison for a live aboard was
blackbeards and by comparison aqua cat was luxury. the crew was great,
food very good, quarters also very good. i wasn't that impressed with
the diving- bahamas in the winter, except the shark dive. it was one of
the best of all dives i have done. it is different from UNESCO in
freeport where they make you sit on the bottom and a feeder does the
work. aqua cat makes a fish gut popsicle  and suspends it in the water.
once the sharks start feeding the divers can mingle. it is really quite
an experience. my pics are at:    http://www.public.asu.edu/~elliotg/
elliott