Looks like I'm the winner. I have 13. They are in continuous use.....perfect for kids to use for their check out dives.
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The steel 72s I've used are nowhere NEAR as heavy as the 104s, 108s, and 130s that I've used. I love those 72s. Wish I had half a dozen or so.
I guess it depends. If you are used to single small tanks, doubles can seem heavy.
I remember one day at the quarry -- a few of us were setting up our gear, everything from double 72s to double 130s. Some teenage girl comes out of the water whining about how unimaginably heavy her single Al80 is (note that the camband on her BC is right at the very top of her tank and we were surprised the tank didn't fall out of the BC...that would have been a riot)...she walks right by our 5 sets of doubles (as we're setting up our gear) and keeps on whining...