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They are legally approved for diving this side of the Ocean, and they are not substantially more expensive than steel, on the contrary, the price is about the same.
The only thing that makes me doubt about buying a second one (first is a steel 15lts with int) is just that: I have a int octopus and you can't use 300bars with int, only din.
The only carbon fiber tanks I know of that are approved for diving are the Interspiro (AGA)
Like CC says, the US is lagging behind the times in approving them for use over here, but you can get them where you're at.
AGA had 4500psi tanks over 30 years ago, it's just now becoming possible to get a fill for the critters.
For what it's worth, Luxfer has been working on a fiber wrapped 104 or 105 cu ft tank @ 4200 psi. As far as I know the DOT has not certified it yet. Also fiber wrapped tanks in the U.S. have a 15 year life span. This is a DOT regulation.
Interspiro is in the process of having their diving tanks approved for use in the USA by the DOT at this time. They are possitive bouyant and require a ballast weight attached between the tanks. I dove the steel version of the system (which was negative bouyant) back in the seventies and it was the best thing I ever used. In non diving applications composite tanks have been around a long time with operating pressures up to 25,000 psig. Diving equipment is so sadly behind the times, esspecially in the USA. When Interspiro gets their Divator system approved I will get one but it isn't going to be cheap, I am expecting around $3,000 usd.
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