[SVD]

I was rather glad to learn when I went to get my 20lb CO2 tank re-filled that, at least here in Kansas City, they've changed over to doing exchanges instead. Mostly because they only do actual CO2 filling at one central location, but partly so they can make sure they only refill tanks in good shape.

I'll still need to occasionaly replace my 20oz tanks but for CO2 those are cheap.

Never personally seen a SCUBA tank go but I've seen what they've done with them on Mythbusters and remember an incident where I saw the aftermath of a peanut tank getting dropped - managed to miss everyone crowded into the very small shop, go through the outside wall and take a neat chunk out of a telephone pole about 40 feet down the road. Until they got it replaced you could see the (reasonably) neat half circle about 20 feet above the ground.

Taught me to respect pressurized gasses.