I went to T&C in June 2015 with 3 friends - 2 certified divers and one that wanted to do the intro PADI dive.
Aqua TCI is a wonderful dive company - right from the start when I contacted them to ask about setting up dives for my first trip to T&C, Steph was amazing. She responded quickly and gave me a plethora of information and wanted to make sure we had an amazing trip. She and Bill did not disappoint - we had 3 marvelous days of diving with them. The boat staff are all incredible - felt extremely safe with them and they are excellent dive guides. I'm not sure how they summoned the dolphins almost on cue - but I think the marine life likes them too :)
I HIGHLY recommend diving with them - you will not be disappointed. I will definitely be back and will for sure be diving with Bill & Steph again.