I have one issue with that Walter. I want to do wreck penetration. I can't see sidemount working off a boat in current and in 1 to 3 ft seas. From my observations you have to be in the water and then strap your tanks on for sidemount. I can't see that working in the ocean. I can carry HP100's doubled on my back with no problem. Sidemount seems to take a bit longer with carrying individual tanks to the water, leaving them, suiting up, returning to the water and strapping them on. With doubles, I suit up and go down to the water and I am ready to dive. That is my main issue...sidemounting from a boat in the ocean.