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I used it with a 19 cu ft pony attached to a steel HP100. I found as I swam with this every once in a while, depending on the surge/currents, a torque tending to twist me sideways. Nothing severe, but it made me check to see if anything is snagging the pony. A much more stable system is the Dive Rite kit to sling the pony in front. Its also reassuring to see the backup bottle and reg in your field of view.
Its advertised to work with the 13, but the distance between tank bands exceeds the clamping length of the 13, so cannot hold securely. Looks like it would work nicely for the 19.
As someone else pointed out its very very difficult to find the button to activate the thing under a 7mm wet suit. The only way to use it is to activate on the boat before donning the wetsuit fully, and then you lose half its life on the boat.
compared to my old al80, i was able to shed 8 lbs of lead from my back pouches. i now dive with just 14 lbs in my 7mm suit with hooded vest. my trim is better and air consumption has ped as well. its a nice size too, because on boats you only get a 3000 psi fill, so with the 100 tank you still get more than 80 cu ft of air. i highly recommend this tank.