I have seen them back in 2003 in Sweden
and they were absolutely not new then there. They have been around for at least 10 years now.
They would not be sold and rented if they were not safe.
The nice thing is they are light - if you care - I do - I have to carry ours on my back at times.
BTW They corrode too - the one onboard now has a very nasty rusty ring round the fitting - exactly where the fitting meets the plastic. But we do not fill'em, we swap, so I will keep eye on things next time.