CA-Steve,
As an emergency 'octo' regulator replacement, I have no quarrel with the integrated/inflator Air-2 system. It's convenient, accessible, and works as advertized. I've had no problems controlling bouyancy when the Air2 reg is in my mouth.
However, depending on the length of your BC inflator hose, you will not be able to turn your head fully to the right when the Air-2 is in your mouth. Turning your head sharply might even pull the reg out of your mouth!
The large BC hose also presents some resistance when turning your head to the left, especially if the tank air supply hose is coupled to the inflator hose along its length. Although noticeable, the resistance can be overcome. Just remember to keep a 'tight bite'.
I bought the Air-2 initially to eliminate the clutter of an octo reg--which it did. Eventually, though, I may reattach the octo, clutter and all. Sortta like having a belt AND suspenders...
Warren