My wife and I now have used the i3 on about 25 dives. I admit, I was skeptical at first; now I can't imagine going back to the old-style inflators. Before the end of the first dive I could instinctively reach the toggle switch without looking or fumbling around for it. The valves work as advertised: I could dump them in any position without having to think about or find the appropriate pull cord, and I was surprised at how little water leaked back into the bladder.
I'm also a fan of the hose routing, as the low pressure hose is almost completely hidden and the alternate is neatly tucked in its "octo pocket." It tends to keep things somewhat streamlined, despite being a bulky jacket-style BC.
Overall, I think its a great innovation and I hope it catches on. Love it!