Much of what I liked about the i3 has already been mentioned, so I'll go into a few things that I noticed about it. I demo'ed one through a dive operator and I really liked the fit. I'm a backpacker and it fits just like my favorite pack. Having been certified in 2004, I'm pretty used to a standard inflator, so the muscle memory of reaching up instead of down needed changing. That's something only time would change. Ease of use was definitely there. I will very likely purchase one in the future for tropical, non-technical dives. But my decision was ultimately made by two factors: I'm heading into technical diving, and I most often dive a dry suit. Using the i3 with a dry suit was somewhat awkward for me. Since I roll to my right automatically, lifting my left elbow when I'm ascending to vent air from the suit, having to reach down to the lever on the i3 was just awkward. Not impossible by any means, but awkward for me. Perhaps using one more would alleviate that, but the tech aspect was not compatible in any case.