I'll let others do the field testing on this one. The video points out that you don't have to carry all that bulk of multiple 12ies, because you can fill on the go - from a larger tank... There goes the bulk argument.
I could see someone who uses a lot of 12ies going for this - probably for practice or gun tuning. I also wonder... are they still "Stock Class Legal"?
__________________ "Sorry, I'm programmed to do that..."