Backtanner once bubbled...
I would also like to do Lanai just to get it out of the way, so I may have to inquire into a different operator.
Although some people don't like them, I thought Lahaina Divers was great. It's true that there are lots of inexperienced divers on board (some doing intro to scuba), but the crew is really friendly and their
new boat, the Dominion, is probably the nicest dive boat that I've ever been on. It's 46' long, very roomy, and has ample room at the top where you can sit and not get wet.
I dove with them twice, once during a deep specialty course (Molokini) and I liked them so much that I went back with them to Lanai the next day. At Molokini, my instructor and I went off and did our own thing, so I don't know what kind of dive profile the rest of the divers were following. The dives at the Cathedrals in Lanai were awesome. I was happy about the dive sites that the captain and DM picked on both days.
I wouldn't suggest going with them to Molokini unless you don't care about rough boat rides. The trip from Lahaina harbor is about 45-50 min. on the Dominion and about half the trip there and half the trip back can be VERY rough. I think about 9 people on the boat got sick.
I'd dive with them again simply because I loved their boat and crew. I've also heard good things about Extended Horizons. Their boat isn't anywhere near as big, and that means less people on board.