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It has a manual inflation hose but um... it's seriously lacking in that area. It's some flimsley hose thing that comes out of the shoulder harness.... definatly wouldn't depend on it.
Another thing I don't like is the actual lever... you get that thing caught on something under water and rip it off, or it fully inflates you and sends you in an uncontrolled ascent before you can get it under control or something... you could be in some serious trouble.
The thing I like about the I3 system is it deflates from 3 different dump valves (hence the 3 in I3), so you can deflate in pretty much any position you're in. On a normal BC if you're upside your normal inflator won't deflate your BC any, you gotta pull on your bottom dump valve.
Those are the pros and cons I can think of without actually have ever dove the thing... I've just looked at it at my LDS alot and wondered what they were thinking.
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