Extended Horizons is the best diving company I found on Maui. I dove with 4 different companies during a week long trip and returned to EH for all of my last dives because of their fun and personalbe dive masters, environmental ethics, diving skills, great communication, amazing knowledge and an all around high quality diving experience. My last dive was an "ecodive" focused on bouyancy and Hannah worked with me to improve my hover, fin skills (I can go backwards! That's amazing) and other maneuvering skills. I highly recommend the eco dives as a way to take your diving to the next level, either in terms or skills (air conservation! bouyancy! fish ID!) or environmental impact (reef conservation, turtles!). My previous dives were also great, with a twilight and night dive at the same site, so we could see the change and be familiar with the dive details. Also a dive to Lanai Cathedrals with all of the amazing details mentioned in a previous review - knowledgable, thoughtful, kind dive masters and boat captain, great dive companions and all around extraordinary experience.