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I don't have a set of small doubles, but one of the big attractions for me would be not having to change over my regs to singles. I'm close to having a full-time singles set, but need another reg or two before I can get there, and those always seem to wind up as stage regs
Yes it would be cheaper, however much less enjoyable. Its true that if you are on a budget, this is not the best choice for you. Its not really about the "cheapest" way to breathe gas under water, I think its more about HOW you want to do it. I chose these tanks because I enjoyed diving them more, and in my particular case were overall easier for me to dive due to my particular gear configuration. My first dive is almost always on large doubles, and to take a singles kit along on board is just more stuff to lose/break/deal with. I know as I did this for quite some time. It also allows you a level of redundancy, thus peace of mind, that a singles setup does not. When I dove a single tank setup, I always slung a pony bottle. now I dont always have to sling a pony bottle. And its much harder to forget/blow off my backup, as its strapped to my back!
