My wife and I have been to Turks and Caicos on 3 previous occasions and dove with bigger outfits but I would recommend Aqua TCI above all of the others!
The group was small and intimate on purpose, Stephanie, Bill, and the entire crew were attentive and helpful whether you are an advanced diver or a beginner.
They took us to sites that weren't crowded with all of the other dive companies allowing us to see more marine life (turtles, dolphins, and sharks along with the normal gathering of reef fish).
The whole outfit is professional, polite, fun, and safe. Keep up the great work!