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Guest
Correct!
We use the AIR II in training. The shoulder and bottom dumps are most effective and easiest to use.
The problem with the traditional dump method of holding the auto-inflator above your head is you can inadvertently push the wrong button which causes you to ascend rapidly.
Also, it takes way to much effort. As divers we are generally looking for the most efficient method - i.e. we are lazy.
Could happen but the design does what it can to avert such a mistake. On both the Air2 and the Balanced Power Inflator, the manual inflate/dump is a very big rectangle and the power inflate is a small button. I find them to be easier to use than the conventional "K" style inflator as both buttons are easier to access. I have replaced all my "K" inflators that came on my wings with Scubapro BPIs. It does not take much practice to avoid such mistakes.