I have back mounted pony tanks in the past, I currently sling if diving a single (which I usually do not carry a pony anyway slung or back mounted). I do not like having anything in front of me and the slung pony does find itself in my way sometimes but all in all I find it simpler, easier, less obtrusive, more minimal and better streamlining and there is the option of unhooking the slung pony in some weird scenario we could invent.
But back mounted it is completely out of my way and I can run the regulator hose around and necklace it instead of leaving it bundled to the pony as I do when slinging.
I do not carry a octopus/safe second when solo. My pony or independent 72s each have a regulator and are fully redundant.
N
Nemrod,
Forgive me but I am confused (it is very late here in Libya now), do you prefer slung or back mounted pony?