I love my GT 3/CDX5. Being a fairly new diver, 50 dives now, I researched a lot before sinking my money into equiptment. I haven't been disappointed. I don't know about anyone else, but there are so many choices, so I decided to stay with Oceanic because my LDS was an authorized dealer. I like being able to adjust my regulator having used another brand with this feature in Hawaii. Also the GT 3 doesn't breathe so "easy" that I go through my air. Does that make sense? It just seems very comfortable. Also the light weight was important to me because I found that having a heavier regulator in my mouth cause more fatigue on my jaw muscles. Another feature I liked about it was the shape and how it conforms to my chin. I have been very happy with my purchase!