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Depends on what you want to do and how you see yourself progressing. I passed my OW/AOW abroad but as soon as I hit UK waters I just knew that relying on a Buddy for air was not a serious option. So I bought my son and I a pair of ponies, back mounted 232 3l as were already using 12l 232 stuff on A clamps. We dont expect to dive below 30m so it would get us to the surface if required including a safety stop etc. If we go twins later they will act as stages or I might just fill it wth 100% 02 for emergency use above water.
We are happy with ours as back mounted and inverted means we can regulate the gas if it free flows and the weight doesnt cause any balance problems. I doubt if you'll get any definite answer just a series of options and info that will allow you to make an informed decision. For less than 30m I think a pony is a good way to go, it avoids too much complication, it makes transport of gas fairly easy for 2 people and it doesnt cost the Earth, personal opinion only and I'm sure others might suggest twinning up. Either way works if you are looking at redundancy and that's definitely a sensible thing to do.
HTH
Matt  |