I have one on order and already have the 300 bar filter housing here just need to order the molecular sieve media to ensure no moisture gets into a cylinder or gun
many have bought them in the US and they seem to work well but you have to operate them correctly to avoid damage
when I'm finished it'll probally cost me £400-450 to build it how I want it -will I get my money back over taking my dive tank I think so as it's £5 a fill but cost's me £20 in fuel and two hours there and back so in reality a fill costs me £25 plus £40 for what I'd earn in the time it takes to go to the dive shop
when you factor that in it'll only 6 or 7 fills to break even