Well after diving hard for the last nine years and learning alot along the way, I have a question for everyone. I have meet 3 divers that i have dived with over the years that have been diving since double hoses. All of these people dive simple systems in Florida.......for example, plastic backplate with No B.C., 2" or 2.5" SPG and just a first and second stage, no safe second, no octo. I have asked them about this and most of them responded, we never needed a B.C. nor a second regulator. Hell they only got the SPG because they were tired of second guessing the J valve.