If you are into marine biology, Mike Severns is THE operator to dive with. Superb briefings. The owner, Pauline is incredibly knowledgeable about the marine life, and the DMs are way above average in that area also. Pauline is the person that the other dive ops on Maui go to when they have a question about something they've seen underwater.
Good, safe operation. 12 passengers + 2 DMs. Nice comfortable boat.
In addition to the standard sites, they dive a few sites that others don't, and will sometimes dive out over the sand and algae areas, showing you the creatures that most others aren't aware of.
One reason they find other sites is that the Captain and mate usually go for an exploratory dive during your SI.