I, like other Dive Masters, have two different octos; one for teaching and one for personal use. The octo. that I use for class is one configured with a short hose and an alternate attached to the BC within the triangle (chin to the rib cage). I use this configeration while assisting the students, in that we are all diving the same configeration, and if an emergency comes up the students can count on me having the same set up as they do. However, since I have expanded my training to include TDI, we utilize the long hose. The only trouble that I have had had is when I was with a friend and I was testing out the long hose donation I came upon a new problem. Since I wear a snorkel, when I went to donate the long hose it got "caught" on something. Thinking that it was the tank valve, I gave it a "slight" jerk which in turn snagged the snorkel and flooded the mask. A lession learned in why, (I think), is one reason that ones that teach the long hose donation never use snorkels. Other than that, I believe that ALL Dive Masters should wear the same configeration as the students do.