I've used both lease tanks and owner tanks, each have their
advantages. If you use a lot of gas, usually it's cheaper to lease.
Currently I have two "owner" tanks for oxygen, since I'm not using a
lot like I used to. The one big lookout for owning your own tanks is
to understand how to check the date of the last hydrostatic test
("hydro" in welder jargon). If you aren't paying attention, the guy on
the dock will just give you the next tank in line, and if the date is
getting close, you're liable to have to pay for a new "hydro test",
usually around $20 to $25. I think the date is good for ten years, but
best to ask your local distributor. Oh, and another thing about lease
tanks, they usually give you more gas per fill. For instance, when I
exchange an "owner" oxygen tank, it's filled to 1800 psi; when I get a
lease tank, it's around 2200 psi. Also, when I say "owner" tank, that
means you pay the price for a new tank, but it's generally understood
that you exchange your tank for one on the dock. Although I know
people who own a lot of tanks (with their name on them) and leave them
there to be filled, then pick up the same ones.

Gary

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