Hawaiian Rafting Adventures is incredible. The equipment they provide is top-of-the-line (and all included in the low price, including the dive computer). The boat is FANTASTIC -- I didn't want to get off! The crew was friendly and helpful, and the divemaster, Steve, terrific. I don't normally purchase photos on a vacation, but the photos Steve took with his HUGE camera were irresistable. The dive sites (Dual Arches and 2nd Cathedrals) were beautiful. My husband, daughter, and I have been diving in Turks & Caicos, Curacao, Mexico, and now Hawaii, and this was by far the best dive we've ever taken (which surprised me because we didn't really think our best diving experience would be outside the Caribbean).
I highly recommend this company. If we ever come back to Maui, we will be doing this again.