We did the Trilogy to Molokini and "Turtle Town" this past Monday (7/21/08) and can recommend it highly. It's the service you get that makes them better than the rest. There are a lot to choose from so consider that you really are going to get what you pay for here.
The crew is outstanding and have lots and lots of experience doing this trip. You have no worries about safety or security - both are important to the crew and it permiates consistently through their delivery of a fine experience for everyone. There are no bad apples here -- all four of the guys were friendly, supportive and helpful. None had an "off-day" attitude. They were just as happy to be going as we were. Each has his own duties including boat management, scuba introduction and assistance with the gear, fitting each guest with the properly sized flippers and mask/snorkle. They have wetsuit tops to help keep you warm in all sizes, an introductory course for snorklers, a constant guardian in the water with us, and a neverending watchful eye for any difficulties. They prep you at the beginning of the day about seasickness, dangers of getting too close to coral walls, toe-stubbers on the deck and boat, etc. There is plenty of food for everyone with plenty of second and thirds for those who choose. Go for it. Everything is included except the scuba gear. They also sell underwater cameras and tee shirts and stuff but there is no hard selling of any kind at any time at all. Not at all. You pay bigger for Trilogy than the others for that very comfort.
The trip was early for a reason: Molokini gets wickedly crowded with other boats. The "noodlers" from the other boats eventually anchored and descended upon us and damn near ruined it for my wife and me, but we didn't let them get to us. Trilogy gets you out of there earlier and on to turtle town for the same reason - the others migrate over and flood the area with "noodlers". But hey, this is the most popular dive, so you better understand that first. Still a good dive, but only recommended if you really want to say you dove Molokini and turtle town. Otherwise, know that you can do some better diving on your own at Kapalua bay and Honalua bay, Kaanapali/Black rock, etc.
I did get queezy some and recommend Dramamine to those who are overly sensitive. Ginger powder pills are available to you if you need them and they do work. I didn't use anything and was fine once we got back under way and had some lunch. Another guy was affected worse and he too was better once we got under way after the dives.
The big thing you need to know is this: If you are wanting to do a catamaran snorkle trip, Trilogy is probably your best choice. The crew is entirely what make the trip and you won't get a better set anywhere. They have seen it all and can handle any problem you personally may have. Any problem. They've been there many, many times. See my pictures and trust me. I was just there.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.